However, when the strike force tries to seize the mutant fly, its crib is empty. Scurrying around the darkness of the lab, the flight-capable and surprisingly strong fly mutant strikes and subdues the strike force members one by one, finally leaving only their leader as the last one standing. Latching onto his unprotected face, the fly mutant scratches out his left eye, and in pain he starts wildly firing the anti-mutagen gun around the lab trying to hit his attacker. The fly mutant lands on some unstable chemical canisters, and Baxter's pleas not to shoot go unheeded by the enraged leader, forcing him to seize his "child" and protect him from the resulting explosion with his body. When the smoke clears, all that is left is Baxter's prone body on the lab floor, his research papers burned and damaged, and the mutant nowhere to be found, along with the vials containing the embryonic family members, with only an open widow showing what became of them. Though upset by their failure, Cynthia orders the strike team to recover Baxter's body and any surviving scraps of research they can get, stating that Baxter's creation must live on, so that a new world will write itself. Unnoticed by the TCRI goons, the vial of perfected Ooze that was within Stockman's sleeve falls free as they are moving his corpse, rolling into a nearby drain grating and falling into the sewers below...
In the present, in the underground sewers of New York City, four shadowy reptilian figures don face masks and test out their ninja weaponry, a staff, Nunchaku, Sai and Swords. Bursting from a sewer grate, the four acrobatically parkour across the rooftops before the clouds pass and illuminate them in the moonlight, revealing them to be humanoid mutant turtles, clad in Ninja outfits. Their blue-clad leader, Leonardo, reiterates the importance of the mission their master, Splinter, has provided them tonight, that it will take all of their stealth, skill and cunning to infiltrate the human world and retrieve the important items from their list....starting with Gogurt. The other three turtles (Michelangelo, Raphael, and Donatello) start mocking Leo for his "Batman voice" in trying to hype up their mission, deflating the tension and revealing that the quartet are teenagers out on a shopping trip for supplies for their home, such as ice cream and Cool Ranch Doritos. After dividing up the tasks they need to achieve for the night, Leo reminds his brothers that they cannot be seen by any humans whilst out getting supplies, as per their master's reminder...
- The Turtles: (Resignedly) "Humans are the demon scum of the Earth, Avoid them, Don't say Hi, They lust to murder that which is different from them, to interact with them is to die."
Leo: And hey, I know that's objectively prejudiced, but that's what dad taught us.
Despite that, all the brothers agree that they actually think humans and their culture is pretty cool, speaking admirably of several stars like Music/Beyonce and Guy Fieri, before Leo reluctantly reminds them that they've got a job to do regardless. Using their ninja skills to remain out of sight, the brothers successfully steal supplies from corner shops, shipping containers at the docks and cargo trucks mid-transport. After successfully fulfilling all the items on their list, the brothers reconvene on a rooftop, passing by a billboard announcement noting the rising crime wave in the city....committed instead by a criminal mastermind known only by his street nickname of "Superfly", with his latest successful theft of an Industrial-Grade power converter raising concerns amongst New Yorkers enough that parents have started calling for a curfew after dark until the crime lord is caught. Noting that they've succeeded in fulfilling Splinter's tasks, Leo is ready to head home, only for his brothers to object, pointing out that they've only been out for an hour, and they can afford to spend a little more time out exploring the wonders of the human world. Despite Leo's objections that they'd agreed to stop spending so much time out enjoying human activities like watching baseball games or concerts, Donnie notes that their Shut-In of a father won't know how long it takes them to gather their supplies, and the trio happily head off to catch a late-night movie viewing in Madison Square gardens, followed reluctantly by leo.
Whilst watching the screening of Ferris Bueller's Day Off, the brothers express their admiration for high school life, hoping one day everybody would love and accept them like they did Ferris Bueller. Looking down upon the human teenagers hanging out, having fun together with their significant others and goofing off together, the Turtles feel keenly the sense of isolation their non-human status brings them, reluctantly leaving and heading back below ground whilst looking out longingly at a world they they cannot be a part of.
On reaching their sewer home and trying to sneak in under the cover of darkness, the quartet are surprised by their father figure, Master Splinter, waiting for them in his armchair, surprising them by turning the lights on and revealing that he's an elderly mutated rat. Suspicious about the length of time the boys have taken whilst "shopping", he pressures them about their whereabouts until Leo eventually cracks and admits the truth. Disgusted at the idea of the teenagers staying out to watch a human movie, and upset that they don't see it as a big deal, Splinter decides to remind the teenagers of the reason why they cannot interact with humans, on top of them being "disgusting monsters who'll milk [them] for their blood". When the Turtles protest over hearing the tale again, Splitner decides he'll regale them with the extra-long version just for that. 15 years ago, Splinter was once an ordinary rat in his mid-twenties and was at the bottom of the pecking order, hated by fellow rats, racoons, and dogs, with humans being the ones who most attacked him whilst he was out scavenging for food. He only possessed one friend in the world — Kevin, a cockroach...who was stepped on by a passing human. And then had his corpse eaten by a hungry Splinter.
On a rainy night, whilst exploring a storm drain for food, Splinter found a discarded Hotdog...and behind it, the broken canister of Stockman's Ooze, the contents of which had leaked out and covered four abandoned baby turtles in the sewers. Though initially fearful towards them, the babies cuddled up to Splinter and showed no animosity towards him, the first beings in his life that had done so. Touched by their kindness and unwilling to leave them, Splinter dragged them Quartet back to his sever home in an egg carton, getting covered in the ooze himself along the way. This exposure swiftly (and painfully) transformed Splinter into a humanoid rat mutant as the Ooze seemed into his skin, transforming into an adult whilst the Turtles became humanoid baby mutants due to their younger ages. Though weirded out by their transformation, Splinter took on the role of a father figure to the Turtles, scavenging human curiosities and junk to turn the Sewer hideout into an actual home for their new family.
As the Turtles grew older and became more curious about the surface, he decided to take them on a trip outside to see if their altered state would allow them to interact with humans better. Emerging into the streets above, the family's amazement with the bright lights and sounds of the city swiftly turned to fear when the civilians (particularly ones adjacent to a silver-painted statue guy and a mascot in a homemade-looking SpongeBob costume) noticed their inhuman appearances, an angry mob swiftly forming intending to attack them, After nearly losing Mikey to a traffic accident, Splinter swiftly fled with his sons back into the sewers. Convinced from the experience that humans would never accept his family and would attack them on sight, Splinter realized there was only one logical way to protect themselves...turning their bodies into weapons of destructions through Japanese ninjutsu. Using old video tapes and kung-fu movies, scavenging the Turtles' weapons and gear from around the city, Splinter spent the next 15 years training his family into the stealthy ninjas they've become by the present day, even if his own advanced age means he is not able to accompany them on their surface shopping trips anymore.
Catching up to the present, Splinter sadly notes that he's so strict with their topside activates because their small mutant family is all he'll ever have, them being the only mutants in the world, and he's terrified of losing his sons from them interacting with a world that hates and fears them on sight. Though reluctant, Splinter grounds the Turtles for one month, forbidding them from leaving the sewers, with Raph, Donnie and Mikey making their displeasure towards Leo for this punishment he brought on them clear. Afterwards, the four brothers sadly discuss what they'd do if they could actually interact normally with the human world without fears of being rejected, talking about their dreams of going to high school, making friends their own age and even getting a girlfriend in Leo's case. Moping over the impossibility of their dreams, the Quartet eventually go to sleep.
A trio of thugs coordinate an heist on a van containing a radioactive storage unit under orders from Superfly, faking a traffic diversion to lure it into a side-street so they can blow the tires out with spikes and switch the Storage Unit unto their getaway vehicle of an ice-cream truck. Whilst successful, the increased police presence on the streets as a result of the crime wave has them swiftly noticed and pursued by the cops, getting cut off with a police blockade ahead of them. Seeing no way out, the thugs prepare of their imminent capture...before a giant winged shadowy thing grabs onto the top of the ice cream truck and bodily lifts the whole thing up over the blockade, flying through the city skyline to the panic of its unwitting passengers. The truck continues flying past the city limits, eventually approaching an abandoned and derelict tanker ship washed up in an old ship graveyard, and gets dropped within by their flying "rescuer". Disorientated from the fall, the thugs look around their surroundings to see more shadowy, inhuman forms moving in the shadows of the tanker, surrounding them. The truck's doors get ripped open and a menacing inhuman shadow approaches them through the smoke, to the mounting horror of the thugs as they realize what this thing is.
The terrified thugs' final screams ring out throughout the ship, revealed to be the abandoned property of TCRI...
At the headquarters of TCRI, Cynthia Utrom is brooding over the numbers failed specimens stacked in jars around her office; all failures at attempting to replicate Stockman's mutagen formula. The squad leader (now sporting a metallic eyepatch over his damaged eye) enters to inform her of the Storage unit theft, the latest of several brazen attacks targeting TCRI machinery. Seeing the news report of the flying ice cream truck, Cynthia's attention turns back to the framed remnants of Stockman's research notes in her office, her eyes drawn to the barely-legible burned scrap of paper demoting the "housefly" experiment. Putting the pieces together, Cynthia orders the squad leader to put tracking devices on all their machine shipments going forward, planning to meet the mysterious criminal targeting her company and finish what they started long ago...
Continuing her rant at the brothers whilst they argue over the merits of checking in on her wellbeing (and leo being mocked by the others for them instantly being able to tell he's got a crush on her) the girl fails to notice a passing thief pick up her scooter behind her and and drive off with it despite Leo's warnings until it's too late. Feeling upset over her loss and responsible for the theft (as well as mostly being motivated by said crush) Leo for once overrides his brother's objections and sets off to retrieve the scooter on his own, followed by his brothers down to street level, with the girl barely catching a glimpse of them to follow after. Following the thief to a auto repair shop, Leo tries to set up a foolproof plan of attack to take out their quarry and retrieve the scooter before Raph ignores him and and just charges into the shop...only for the brothers to discover that there were a lot more thugs already at work inside the chop shop, leaving them all outnumbered and without the element of surprise.
Confused by their strange appearance, the thugs discuss amongst themselves if their intruders are preforming mascots or something else whilst the panicking brothers try to think of some way to resolve the mess they're in, Donnie pointing out that they've never been in a fight period until right now. Raph, eager for a fight, overides their objections to try and charge into their opposition, only to mess up, accidentally stab Donnie in the leg and blow up the rest of his brothers with an air canister. Despite the poor first start, the turtles' muscle memories of their training as well as their natural agility and adaptability enables them to hold their own in a fight, even as the situation spirals further out of control and a fire starts inside the shop. After thwarting the leader's last-ditch attempt to use a car as a ramming tool against them, the brother exult in their victory, only for the girl to suddenly enter the shop, having successfully followed them, forcing them to quickly hide as best they can whilst setting her scooter upright.
Surprised by the utterly thrashed state of the thugs and her scooter being laid out in pristine condition for her, the girl soon spots the brothers' flimsy attempts to hide in the shadows of the shop, asking them to come out so she can properly thank them for saving her scooter, deciding their good deed makes them square for the ninja star incident. With no way to hide, the brothers eventually emerge from the shadows, leaving the girl surprised by the "realistic costumes" on these crime-fighters until she tries to get them off and realizes that they're real. On the verge of a Freak Out, Mikey manages to diffuse the tension by asking if the girl is cool with some Pizza whilst they explain everything about themselves.
On a nearby rooftop, the girl introduces herself as April O'Neil, a student for her high school paper and an aspiring journalist, taking notes on the Turtles' origins and quizzing them about their lives. April explains that she was in the seedy neighbourhood in the first place looking for leads on Superfly and his recent string of crimes, as the rising crime wave has spoken the city's parents enough to invoke a city-wide curfew, cancelling her high school prom, and April hoped that by tracking down Superfly and bringing him to justice she can get the event restarted. Having found the Turtles instead however, she's delighted by the opportunity to write a story on them now, only for her new friends to argue back against that, citing their prior bad experience with trying to integrate into humanity (and the danger of them being "milked" to April's confusion). After considering Mikey's query if it's possible for other humans out their to accept them, April bluntly admits that there's practically no chance of it, confessing that she's only not scared of them because of the heroic deed they committed in getting back her scooter.
Getting texts from their respective parents to return home, April and the turtles part ways after exchanging contact info. On their way back through the sewer tunnels, the teens exult again over the night's events, wanting to experience most positive contact with the human world and the adrenaline rush of their fight. When Leo brings up April's point about only feeling goodwill towards the turtles because their actions proved they weren't dangerous, Donnie get the idea to do the same thing on a larger scale. Pointing to an announcement of the latest theft of Superfly's, he points out that if the brothers were to track the dangerous criminal down, use their ninja skills to capture him and turn him into the police, it'd get them seen as heroes citywide. Once the adulations had died down, they could use that to enrol in normal high school and be accepted by the populace at large. Excited for the chance to live their dreams (and Leo wanting to see more of April) the Quartet agree to proceed with the plan, getting April's cooperation to meet at her high school of Eastman high to outline their plan of attack, whilst Splinter grows suspicious of his sons' enthusiasm on leaving...
Parkouring through the City, the brothers meet up with April outside the high school, becoming awestruck at the mundane interior of the building as she walks them through it, with Donnie geeking out over an Attack on Titan scrawl on one of the lockers, finding camaraderie in his nerdy interests with the owner. Mikey likewise is enthused by a sign-up sheet for a comedy improv club, desiring to get his name added ahead of schedule in preparation for them eventually joining the school, believing their plan to capture Superfly will be complete in a few weeks. Briefly stymied by the sheet needing a last name (and the Quartet realizing they don't actually have those, Mikey decides to just cleave up his name to make "Michael Angelo" instead. When Raph and Donnie tease Leo by realizing the same logic would make his name "Leo Nardo", he attempts to deflect by pointing out a nearby locker with "Puke Girl" scrubbed across it, claiming Nardo's still better than that. When noticing April's flustered reaction to that and seeing a further scribble of "April O'Puke", Raph realizes that it's her locker, forcing a reluctant April to admit the truth to the brothers.
Following her journalistic desires, April thought she could get a start in that by reading the school's morning announcements, only for her first time in front of the cameras to be more overwhelming that she'd realized. Hit by a massive anxiety attack, April felt like she was going to explode from the stress...
- Leo: You didn't.
April: I did.
... Cue April exploding with vomit all over the desk, broadcast throughout the entire school, eventually fainting whilst still spewing her guts out. Humiliated, April admits the incident when utterly viral, resulting in her getting remixed, memed and winding up on Tiktok, ensuring she was widely known as a social pariah amongst her peers. April states that the real reason she was looking for Superfly was so she could have a journalistic success that enabled her to remain off-camera, whilst also hoping that by getting the Prom un-cancelled, she'd be known for something cool that could let her move on from being "Puke Girl", explicitly comparing her motivations with the Turtles' own.
In the school's photography class dark room, April shows the brothers her hidden assembled board of Superfly's past crimes, explaining that his heists indicate he's using the stolen technology to build something, as in "Gru, Megamind''-type stuff", whilst using street thugs as pawns to ensure he stays under the radar, additionally killing anybody who witnesses him in person.
When Leo asks what their first step will be in tracking down the illusive criminal, April brings up the theft of the radioactive storage unit, revealing to the brothers that she found a sketch of the same device in the chop shop that stole her scooter, proving that the criminals who ran it have had dealings with Superfly. April's investigation revealed that the chop shop is part of a extended crime ring run by 5 individuals, Bald Bronson, Short Sharon, Toupee Tom, Normal Nate and Bad Bernie. With their targets set, the brothers head out to each head's place of business over the next few days, a secret poker game room, a pool bar, a chinese restaurant, a mattress shop, and a secret drug lab, beating their way through each place's assembled thugs to interrogate the head and rapidly improving their combat experience as a team compared to the chop shop. As April records their deeds and starts printing them in the school newspaper to the quintet's mutual delight at the growing intrest amoungst the student body, the Turtles also find time to scavenge some human outfits from the criminals along the way in preparation for their eventual integration into high school, as Splinter grows more suspicious of his sons' late-night excursions.
Upon capturing and interrogating each head, they pass the responsibility of dealing with Superfly onto the next until the Turtles eventually corner Bad Bernie, who cracks. Admitting that it was his men who stole the storage unit, he reveals that Superfly contacted him after their deaths and threatened him to get a final component, an assimilator, or share their fate, with Bernie having succeeded in robbing the part last night. Having agreed to meet up with Superfly directly to hand it over under the Brooklyn Bridge tonight and finally cut their dealings with him for good, the brothers now have their window of opportunity to capture the mastermind.
As they congratulate each other over their imminent success at stopping Superfly, they get a text from Splinter informing them of an emergency. Taking April with them as they navigate the underground tunnel network towards their sewer home, they leave their human friend just outside whilst they venture into the darkness of their abode...and get surprised by Splinter suddenly turning on the lights, revealing that the text was a ruse to bring them home for a surprise party. Having found their human outfits whilst going through the boy's belongings, Splinter attempts to dissuade his sons from the dangers of interacting with humans by bringing the human world to them, using cardboard cutouts of celebrities to pretend interact with "real" humans and turning their dining area into a makeshift restaurant. Though touched by his efforts, the impending deadline to meet with Superfly forces the Turtles to make the excuse that they've still got errands to run, leaving the despondent Splinter behind in their home whilst they again head to the surface.
With Donnie driving the van containing the assimilator to the setting point (thanks to his long hours of playing Forza Horizon) the Turtles prepare to ambush Superfly, in radio communication with April hiding nearby and ready to record the entire exchange. Superfly's crew soon arrive, rolling up in a monster truck, a motorcycle and a souped-up muscle car, with Leo estimating they only have to contend with 10 goons, tops. As Raph excitedly grins that he can't wait to see their shock at facing a bunch of mutants instead of their buyers, the monsters truck driver and motorbike user step out in front of their headlights...revealing themselves to be a large, hulking mutant Warthog and Rhinoceros, to the teen's collective shock. Playing a boombox track to accompany his entrance, the criminal mastermind himself steps out of the muscle car, revealing that Superfly is the grownup version of Baxter's fly mutant, multi-armed, muscular and imposing as he struts towards the van. The rest of his crew emerge from their vehicles, revealing that all of them are the mutated animals Baxter intended to be his children.
Whilst the Turtles are still arguing over what to do with this change of events, Superfly zips into their van with lightning speed and tears the windshield off, exposing them to the mutant crew. Though surprised that Bad Bernie apparently also had mutants on his payroll, Superfly is delighted to see more mutant brethren, terming the Turtles as "adorable". As they talk, Superfly explains their shared origins, deducing that the Turtles were mutated from his "father's" Ooze and believing that Baxter intentionally dumped it into the sewers to keep it away from TCRI. As a result, he claims that both the Turtles and his own mutant crew are "cousins", to their collective joy. Superfly introduces the rest of his crew, Bebop and Rocksteady the mutant warthog and rhino respectively, Wingnut, a bat mutant with cybernetic arms, Ray Fillet, a manta ray with a tendency to sing his own name, Leatherhead, a crocodile mutant dressed like a australian hunter, diminutive frog mutant Genghis Frog (who gets irritated by the Turtles squeeing over how adorable he is), Scumbug, a cockroach mutant who can only speak vermin (and freaks the Turtles out with her hideous appearance as well) and Mondo Gecko, a Totally Radical gecko mutant who instantly bonds with Mikey over their shared "vibes".
Despite their joy at finding new brethren, Leo refocuses his brothers as to why they're here, confronting Superfly over the "super weapon" he's building with his heists. The fly mutant scoffs at their insinuation, claiming his device is the exact opposite, that it will create rather than destroy. Interested, the Turtles agree to hear him out, and Superfly offers to take them somewhere more fun whilst they chat; a closed bowling alley. The two mutant groups start bonding with each other as they settle into the abandoned building, Raph, Bebop and Rocksteady sharing similar aggressive personalities, Wingnut and Donnie playing arcade machines (with Leatherhead helping to crack open some machines for extra quarters for them) and Mikey and Mondo messing around with the bowling machines. Outside, April quizzes leo as to the state of affairs, pushing him to get more answers about Superfly's intentions if he's sincere about being non-hostile towards them. As the mutants all settle down to eat a meal, Superfly continues his explanation, saying that what he ultimately aims to achieve is acceptance, to the Turtles' relief, as the bug mutant recounts his story from the beginning...
With his earliest memories being of how his father Stockman yearned for acceptance and wanted to achieve that with his mutant family, after losing him to TCRI's attack, the baby Superfly wandered through the city with the vials of his siblings in his arms before coming across the abandoned tanker, seeking shelter within. As the oldest of the mutants, Superfly took it upon himself to raise them, scavenging food and supplies to feed them as they all steadily grew up. Watching TV commercials of human life in their home, the Mutant crew, despite acknowledging that they lost their father to humans, still believed that maybe not every humans was as bad as his attackers. Like the Turtles, they too tried to integrate into Human civilisation, heading out into a street side cafe to greet the humans... and like the Turtles, they too were met with fear and rejections, ultimately fleeing for their lives from an angry mob. Whilst the turtles admit they too had a similar experience, Superfly recounts that in their case, there was one particularly determined aggressor, a human who chased after his family with a baseball bat, either not realizing or not caring that the mob hadn't followed after them. In contrast to Splinter's decision to remain in hiding (which Superfly derides as a "punk" choice) the bug mutant instead turned on his aggressor, violently beating him down to within an inch of his life. The experience taught Superfly two things: that Human-Mutant integration was impossible, and how good it felt to hurt humans instead of taking their abuse. To that end, he came up with a Plan to achieve his acceptance: killing all the humans and letting mutant kind rule the earth instead.
- Mikey: (Beat)...That's a take.
Superfly explains that he was somehow able to inherit Stockman's genius-level knack for science, and has been using it to build a machine to enact his grand plan, having assembled all the necessary parts except for the assimilator the brothers just handed him. Using his mutagen-laced blood, Superfly has refined and re-created Stockman's Mutagen formula, and intends to use his device to launch the Ooze into the atmosphere, dispersing it as an aerosol worldwide and allowing it to mutate every non-human being on earth, bug, avian, animal, and aquatic, allowing Mutankind to become the dominant species on earth. Listening in to his speech, a horrified April states that his plans really were very, very bad...for her and every other human being. When Donnie queries what will happen to humankind in this new world, Superfly scoffs that it'll be "nothing good", though he hasn't really thought that far ahead yet. Whilst Mondo admits that the mutants wish there was another way they could feel safe and happy, all of them support Superfly's plan as their only option for acceptance. The group leaves the bowling Alley as Superfly tosses some hypothetical ideas around for humans, considering if they'll maybe become pets or get put into "redhead shows" for entertainment, advising the brothers to pitch their ideas in before they use the assimilator to finish the plan tonight.
Recording their conversation, April pushes the Turtles to do something, pointing out that they just helped an evil villain with the final part of their diabolical plan, whilst the brothers are conflicted with turning against their new brethren despite their support of humans. When Leo brings up the "hypothetical" scenario that the Turtles might not support Superfly's plans, the hulking bug mutant turns intimidating, warning them that that would piss him off and demonstrating by casually squashing a fire hydrant to illustrate what would become of them crossing him, intimidating the teenagers into affirming their support of his plan. Unable to openly confront him, Donnie decides to side-step the need for a fight, offering to have the Turtles drive the van with the assimilator to Superfly's lair whilst he leads the way, hoping to be able to evade the mutants in the vehicle and keep the part out of their hands. Though Superfly agrees with their offer, he insists that Wingnut, Mondo and Rocksteady accompany them, as he drives fast and doesn't want the Turtles to get lost on the way.
As the small Mutant convoy peels out, followed by April on her scooter, The brothers furiously argue amongst themselves as to what to fro next, Leo passing the buck to Donnie to come up with a plan of attack. To buy time, Donnie questions Mondo about their destination, with the friendly lizard revealing Superfly's base of operations is the abandoned tanker in a shipping graveyard on Staten Island. Following behind, April says that the Turtles better make their move now, only for Raph to veto the possibility of them being able to win a close-range with a bulky Juggernaut like Rocksteady. Leo realizes that if the turtles can hit the van's breaks, all three mutants, sitting in the front seats, would be ejected whilst the Brothers could hold on in the back of the van, thanks to Superfly tearing away the windshield earlier. Using Donnie's staff to reach the pedal underneath the seats and under the cover of the mutant crew singing along to the radio, Mikey eventually pushes the brakes and causes the van to crash to a halt, flinging the trio out and letting the Turtles hijack it and the cargo, fleeing away pursed by the angry crew, April following closely behind. Unnoticed by the Turtles, the assimilator has a beeping tracker on it, operating in the back of the van as the chase continues through the streets...
The Turtles' attempts to out-drive their pursuers are only mildly successful, the flight-capable Scumbug and Wingnut easily keeping pace with them, and Bebop's monster truck and Rocksteady's motorcycle being too tough to be forced off the road, resulting in the van getting increasingly banged up as the crew yell at the Turtles to stop and hand the machine part over. Noticing Superfly's muscle car fast approaching, the pissed-off fly mutant within Wingnut and Mondo sincerely ask them to just surrender the assimilator before Superfly catches up, noting that their big brother won't be as nice about taking it from them. When the Turtles refuse, Superfly rams the van from behind, hoisting the rear of it onto his car bonnet and letting him personally invade the van whilst Genghis Frog keeps the car driving straight.
Despite the quartet's best attempts to fight him off, the adult mutant's strength easily allows him to beat them down (aided by the fact Leo can't properly swing his blades inside the cramped interior), easily thrashing them and clipping one of Mikey's nunchucks in half with his claw hand. Ripping the van's steering wheel off and using Donnie's staff to pin the accelerator down, Superfly attempts to leave with the assimilator in hand, disgustingly saying he almost thought the Turtles were cool. Desperate to stop him, Leo grabs onto the assimilator as Superfly tries to fly away with it, accidentally holding onto the tracking device whilst his brothers form a Chain of People to keep them anchored to the van. Despite the temporary stalemate, the out-of-control van careens away into the side of a motorway, flying through the concrete barrier and dropping the Turtles down with it, the tracking device tearing off along with their plunge as Superfly leaves them to their fate.
Though the Turtles manage to survive the crash, they are swiftly surrounded by armoured vans, which burst open to reveal squads of armour TCRI soldiers, which surround the helpless brothers, levelling their anti-mutagen guns at them. Looking around, Leo sees April watching their plight from the motorway, calling out to her for help...only for April to turn around and drive away, apparently abandoning the brothers in their moment of need. Exhausted, Leo cannot resist as the Squad Leader approaches him, smacking him unconscious with the butt of his gun.
- Squad Leader: Say goodnight, Freak.
Leo awakens to find himself and his brothers restrained in a strange machine and surrounded by TRCI goons. Cynthia Utrom enters the room, greeting her captives and saying that she's been looking for them for a long time, pleased to have finally captured some of Baxter's mutant creations. When Donnie tries to protest against their captivity and warn Utrom about the danger that Superfly's plan brings to them all, she shuts him up with an electric shock, making it clear that she's not interested in hearing anything they have to say, or what motivations that brought them into her clutches. Cynthia curtly tells the Turtles that they are her "property", repeatedly shocking the brothers when they try to speak up, and explains to them that she intends to use them to reverse-engineer Baxter's mutagen, planning on using the stabilised formula to create an army of mutant super-soldiers: Dolphin mutants to plant submersible bombs, Eagle mutants for Ariel combat and Snake-men mutants for stealthy infiltrations. When the confused brothers query how they can possibly be expected to aid with all that, Cynthia reveals there's only one way to drain the mutagen out of them — through their blood. As she excitedly orders them to get hooked up to the machine, the teenagers realize to their horror that their father was right: the humans intend to milk them to death.
At Superfly's crib in the abandoned tanker, the mutants steadily assemble Superfly's machine piece by piece, whilst Ray Fillet and Mondo Gecko sadly sing some music in the background, clearly still hurting from their cousins' "betrayal". Their moroseness upsets Superfly, who snaps at his family members to cut the noise out and focus on their task, reminding them that the impending extinction of humanity is a happy them for them all, before ordering them all back to work. Downcast, the mutant crew resume their labours.
Down in the Turtles' sewer home, Splinter sadly reminisces over past photos of his sons amongst the remnants of his surprise party decorations, ruminating over the gulf that has opened between them and uncertain of how to make it right. Hearing a noise, Splinter believes it's his sons returning, hopeful that his party worked in the end, only to be shocked into silence by the sight of April standing in the entrance instead. Scared by being confronted face-to-face with another human for he first time in years, Splinter threatens April to keep back, or he'll bite her. Nervous at his aggression, April hesitantly introduces herself as the Turtles' friend, warning Splinter that his sons need both their aid right now...
At TCRI headquarters, Mikey is the first of the Turtles to be slowly drained of his mutagenic blood, the process incredibly painful and distressing for him. His brothers' attempts to calm him down by getting him to think of happy thoughts like Pizza falling flat on their face.
- Mikey: No! Pizza's made of cheese, and cheese is made of milk, and I'm being milked!! It's infiltrated my every thought!
Unmoved by their distress, Cynthia coldly orders that the teenagers continue to be drained of their essence until they have the required amount: enough to fill a container several times larger than them, making it clear that the boys won't be surviving the process, before leaving them as the machine starts draining Raph next. As the teenagers morosely contemplate the impending doom, thinking over all the regrets that have and the things they never got to do, Leo considering if April just used and abandoned them for a good story, the lab is suddenly plunged into darkness as the power cuts out, halting the milking effect on the Turtles. As the emergency lighting activates, Cynthia is forcibly dragged away to safety by some of the security escorts as the rest fan out in preparation for their mysterious intruder.
The door opens to reveal an empty hallway...before Splinter falls down from the vents above, his advanced age preventing him being as stealthy as his sons. Splinter tries to bargain with the TCRI goons menacing him, telling them he doesn't want a fight, just to take his sons back home (whilst also making it very clear to the captured Turtles that they are in a lot of trouble for their deception). When the goons refuse to release them and make it clear they plan to suck Spinter's mutagen out as well, the elderly rat gets serious, using his greater martial arts mastery to utterly wipe the floor in seconds with his aggressors, turning their own stun batons back on them despite throwing out his back doing so. Realizing that Splinter won't go down easily, a chaotic fight erupts as the entire building's security forces descend on the lab, openly firing on Splinter with their anti-mutagen weapons and pursuing him around the lad as he creatively uses his environment to stay one step ahead of them. Eventually however, their sheer numbers seem to overwhelm Splinter, shocking him and knocking him backwards into a storage cabinet that falls atop him and crushes him...only for Splinter to cut his way out of the cabinet, brandishing all of his son's weapons at once, the ninjutsu weaponry having been kept within. Armed with the weapons he's been training his sons with for years, Splinter single-handedly beats every last one of his armed and armoured foes, even smacking the squad leader down with a Groin Attack from Mikey's nunchuck...and a followup strike to the jaw when he still tries to rise back up.
Splinter unlocks the boys' restraints and the mutant family happily reunite. When Leo questions how he found out about their peril, April enters the lab from a side-vent, sheepishly saying that she couldn't not try to help her friends out of their jam after she partly got them into it. Whilst the Turtles are overjoyed by April's loyalty, Splinter confronts them over the entire mess, demanding to know what the Turtles have been up to on the surface. Whilst the teens try to down play the severity of their predicament, Splinter recognises what the milking machine is (helped by the massive plaque on the side denoting it as the "Mega Milker 2000"). Upset over his sons' lies, and how their recklessness has both resulted in the exact outcome he repeatedly warned them about and endangered "The only good human, April" through helping Superfly build his machine, Splinter lays down his ultimatum: he and the Turtles will stop Superfly, destroy the machine, and then return to the sewers. Permanently. Ordering April back to the safety of her own home as well and telling to forgot about her story, Splinter reprimands his sons once more, stating that the only way that they can be safe and happy is by listening to him and following his orders.
Outside, April and the Turtles' path diverge on the steps of the TCRI building, Leo taking a moment to apologise to her for their failure to uncancel the prom. April brushes it off, admitting to Leo that seeing the brothers' screw-ups in their quest to gain popularity with the public made her realize she also wasn't following the Superfly story for the right reasons, turning away from her friends as they walk away into the night, Leo taking one last look at her before following. April's return home is thwarted however, by her scooter having burst its tire from the intense chase, leaving her with no easy way back. As she curses her luck, more TCRI goons zip past April on hi-tech motorbikes, parking outside the building as the goons rush inside to provide backup for their colleagues within, as April's gaze shifts to the still-idling motorbike...
At Superfly's hideout, The mutant family infiltrate the tanker ship, lit from within by the green glow of Superfly's machine hooked up to his mutagen supplies. Finding the place seemingly abandoned, Mikey queries if they gave up and left the machine behind, only for Superfly to turn the lights on, revealing it was a trap they laid for the turtles' eventual interference with their plan. Surrounded by his crew (with Mondo being pleased to see their cousins again) the Turtles are prepared to fight through their mutant brethren if necessary to stop the machine being used, even if they're reluctant to fight their kin. Irritated and confused by their persistent objections to his goal despite their mutant nature, Superfly demands to know what the Turtles find so amazing about humanity that they're turn on their own kind for it. Donnie admits that humans have bad people amongst them like Cynthia Utrom, but says they also have good people like April too, being complicated creatures. Splinter joins in on the argument, admitting that, despite his immense dislike of the human world (and he's still adamant about how much he dislikes them) he cannot stand back and let the mutants wipe out humanity, pointing out to them that doing so makes them just as bad as their oppressors.
Leo states that he adamantly refuses to believe that the mutant crew really want to kill humanity deep down, claiming that they're too awesome and cool to be ok with hurting others like that, citing how much they vibed together at their time in the bowling alley. When a hesitant Mondo speaks up and says that Superfly's plan is the only way for them to be accepted, the Turtles throw in a counter-proposal: Rather than remaining apart, the Turtles will accept the crew into their sewer family, Splinter noting that they've got plenty of room for them to live down there with them. Thinking about it, Ray Fillet adds his voice to their debate, admitting that he doesn't really want to kill humanity, he just wants to sing whenever he pleases. Wingnut voices her agreement, musing that she'd be haunted by all the victims that their plan would create, and she'd prefer to sleep easier at night. Mikey affirms to Mondo that they're totally cool with the crew joining them, and the two quickly get back into their shared "vibes" together.
Superfly however, interrupts the bonding moment, angrily telling his crew to cut out the "Kumbayya" nonsense and just kill the Turtles already. Whilst hesitant to disobey his big brother, mondo ultimately defies him, tossing aside his crowbar and telling Superfly that they want no more part of his violent subjugation of humanity — in fact, Mondo believes none of them ever really wanted to in the first place. They just didn't know any other option but what Superfly told them, but now that the Turtles have shown them a new path, they much prefer to co-exist together in peace without having to hurt humans. Superfly disregards his opinion, telling him that he doesn't "vibe", and neither does his crew, and Mondo better step down and get in line. However, when the rest of the crew back him up, affirming their decision not to activate the machine and telling Superfly to back down instead, the mutant leader takes it badly. Calling out his "family" for their betrayal of him at the eleventh hour, after everything he did to raise them, Superfly gives them an ultimatum. If they want the machine stopped, they gotta go through Superfly to do it, zipping over to the machine and activating it, the ray powering up and pointing out towards the city across the bay.
Though surprised by Superfly's willingness to fight them to sate his vendetta against Humanity, the now united Mutant crew join with the Turtles to attack their former leader. Initially however, their efforts aren't enough, as Superfly's strength, speed and Flight capability make him strong enough to overpower even Bebop and Rocksteady individually and able to keep up with the rest of his numerous foes. Despite damaging the machine, their efforts aren't enough to shut it down and Superfly knocks every mutant back one by one. However, it's a different story when they all rise to their feet and gang-pile him at once, their combined might enough to push him backwards and just barely pin him against the machine's control panel. Stuck and unable to break free, Superfly expresses his bafflement at why his family would fight him so hard for the sake of the enemy, his words resonating uncomfortably close for Splinter, whom has been on the sidelines throughout the mutant-on-mutant fight.
Reeling from the realization of how low he's fallen by allowing his fear and hatred of humanity to dictate how he treats his own family, Splinter is shocked out of his funk when Superfly calls out to him for aid with his predicament. The gang leader points out to the elderly rat that their shared hatred of humans is exactly the same; the only difference being, he's not a passive "punk" about dealing with the threat they bring, unlike Splinter. Upset by realizing how correct Superfly is, that insult is the last straw for the rat-man, who charges in and puts his own weight behind the combined mutant press against Superfly. The combined effort is enough to tip the balance against Superfly, the mutants pushing him through the control panel and forcing him backwards into the Ooze-filled generator below the machine, badly electrocuting him. The damage done to the supports is too much to allow them to lift the machine anymore, and the whole thing collapses down atop Superfly, the weight tearing a hole through the bottom of the tanker and taking the ooze-filled generator down along with the fly mutant to the bottom of the ocean.
Staring down at Superfly's watery grave, alit with the glow of the submerged mutagen, Mikey hesitantly asks if they managed to stop the threat of Superfly's mutagen plan, to which Splinter uncertainly says that it seems to have worked, only to be cut off by an inhuman groaning from the depths. Mondo quickly realizes that in their haste to stop Superfly's machine, they might not have considered the fallout of breaking the ooze-filled weapon.
- Mondo: ...Hey, when the machine that turns a bunch of animals into mutants goes, uh, underwater, and, um, then there's animals in the water- like, what do you think that does?
The massive groaning sounds again as something gigantic shakes the entire tanker moving underneath it, the green glow of the Ooze fading as something swims away through the bay waters. The mutant rush topside to see the glowing mass breaching the surface, revealing it to be Superfly, now fused with a bunch of Aquatic marine life into a gigantic mutant abomination, particularly a whale as the main body with his compound fly eyes, crawling on the beach surface as it steadily makes its way into the city streets, ooze dripping from its polluted insides like saliva. Thanks to lacking legs though, the super-mutant is limited to squirming on its belly and making slow progress with the aid of Superfly's remaining pincer arm, prompting Leo to voice that at least its impaired mobility means things aren't that bad for them...only for the Super-mutant to reach the nearby Rosebank Zoo and hurl itself into it, the Ooze fusing and combining it with the animal inhabitants into a bipedal form, a left arm formed of marine life like Narwhals, animals like elephants and giraffes fusing into its face, and legs formed from mammals like horses.
As the mega-mutant triumphantly roars its success, it suddenly starts speaking in Superfly's voice, revealing his mind is still in control despite his extra-monstrous transformation. Revelling in his newfound power, Superfly declares that he's now a "SuperDuperFly", mockingly thanking the turtles for their accidental "aid" in gifting him the strength he needs to take the fight to all of humanity directly, turning his attention to the main city of New York, promising them a reckoning is coming. With massive mutated fly wings busting from his back, the Super-mutant turns airborne, flying across the bay to siege the city directly, watched by the horrified and stunned mutants left behind on the Tanker.
- Raph: (nervously)...All right, well, uh, you know, we gave it a shot. Back to the Sewer? I got pizza tonight for dinner and-
Leo: Really!?
Donnie points out to Leo that despite their best efforts, they couldn't stop Superfly before he turned into a massive Kaiju super-mutant, and their odds have dwindled into practically non-existence now. Mickey points out that it'd make more sense to let the human army show up and stop the beast instead, with Donnie concurring that they do eventually show up in every Godzilla movie he's watched, only for Splinter to cut their defeatist talk off. Splinter admits he's let his fear and hatred of humanity get the better of him, and that he'd become too similar to Superfly because of it. But he loves his sons, and wants the best for them and if they want humanity to like them, they the united mutants will support them in that endeavour. So they'll be the ones to take down SuperDuperFly, film it to show the world that they're heroes underneath their freakish appearance, and earn the acceptance of humanity that way. Inspired by his Speech, Bebop and Rocksteady say they're 100% behind them on that endeavour, but point out the logical issue: how exactly are they gonna stop a 100-foot tall mutant that can squash them like flies?
At that moment, April phones the Turtles, witnessing SuperDuperFly's rampage from her bedroom window, asking her friends how the heck their attempt to stop the mutant criminal turned into this chaotic mayhem!? Donnie sheepishly admits that a lot happened since they split up, and leo desperately question April if she's got any ideas as to how they could stop the Super-Mutant. Though incredulous that they're counting on her to think of a solution, April's gaze falls on the stolen TCRI bike parked outside her apartment....with one of the Anti-Mutagen guns strapped to it. Seeing a possible hope to save the day, April says she'll meet the mutants at the base of SuperDuperFly's leg, tearing off through the streets towards the chaos as panicking citizens flee around her. Re-invigorated, the mutants head off as one across the bay, Mondo surfing atop Ray Fillet, Ghengis Frog and Leatherhead naturally swimming through the waters, Wingnut carrying Bebop and Rocksteady, and Scumbug carrying the Turtle family a cargo net, whilst accidentally dribbling goop all over them, to their disgust.
The mutant reach the broad walk and meet up with April, with her tossing the gun to Raph as they charge together through the devastation towards SuperDuperFly, exulting in his ability to tear down humanity's cities piece by piece as he smashes through the streets. Taking careful aim (and trying to drown out his fellow mutant's attempts to offer shooting advise all at once) Raph fires a shot that sails through the air...and successfully connects to SuperDuperFly's leg, taking the Super-Mutant off-guard as the anti-mutagen begins to affect him. As the mutants start rejoicing in their success, the formula quickly works....on the lone horse body the shot connected to, turning it back into a normal horse that takes off through the street as the rest of the Super-Mutant's Body of Bodies remains intact.
- SuperDuperFly: That's it!? One little Horse? I don't need that horse! (Death Glare towards the assembled mutants) It looks like y'all wanna die now!!.
SuperDuperFly kicks an abandoned gas tanker like a football towards them, the massive explosion blowing the heroes away. Dazed from the blast, a groggy Mikey witnesses SuperDuperFly swat Wingnut from the sky, whilst Bebp tries to lift a crashed truck off of Rocksteady. Seeing what happens to be part of mondo's tail crushed underneath rubble, Mikey tries to pull him loose, only to have the tail come off in his hands to his horror...before Mondo runs past him for cover, assuring Mikey his mutation let him grow limbs like that easily. Mikey turns around to see a stunner Donnie making his way to him, unaware of SuperDuperFly throwing abandoned vehicles towards him from behind, until Raph tackles him out the way. Taking cover from the Super-mutant's vehicular assault, the brothers try to figure out where everybody is, as Leo shows up, acrobatically dodging SuperDuperFly's projectiles. With a nearby parking garage offering him plenty of ammunition, the Quartet have no choice but to flee, grabbing the mutagen gun as they do. Their attempt to hide inside an abandoned bus fails to escape SuperDuperFly's notice, and he punts the vehicle with it passengers through the air, having it land several blocks away as he exults in how unstoppable he is.
Emerging from the busted vehicle, the Turtles receive worse news, the electronic billboards around them broadcasting news of the fight and portraying the Mutants as one united force attacking humanity, with one newscast noting that military intervention will be happening against all of them. Seeing a frightened mother and child flee at the sight of them, the bruised and battered teens face the crushing truth: despite how they wanted things to go, humans are only going to see them as monsters to be feared.
As Raph despairs over their dreams of being "normal" coming to naught, Leo instead refuses to be cowed by their failure. Admitting that April had a point; that their attempts to be heroes as a selfish means of being accepted was wrong, he still thinks there's worth in them saving the day and being heroes, accepted or not. When Mikey points out how all their plans failed, Leo just retorts that his brother knows how to improvise on his feet better than any of them, even Mark Ruffalo. When Donnie cites how impossible it would be to fight a giant monster like SuperDuperFly, Leo reminds him Anime-obsessed brother that he's read more comic books and consumed more media about people fighting giant monsters than anybody, so he'll absolutely be able to think of an impossible plan for them to follow. After a moment's consideration, Donnie has "Eureka!" Moment: recalling the Attack on Titan scribble, he remembers how the titular monsters' Achilles' Heel was located on the backs of their necks, and as Mikey points to a news camera footage of SuperDuperFly on the billboards, they see that his whale body's blowhole is located exactly there, pulsing with exposed green mutagen. Ejecting the remaining anti-mutagen canister from the gun, Donnie theorises that if they insert it into the blowhole, it'll spread the formula throughout the entire amalgamated monster's bloodstream, de-mutating all the assimilated animals at once. Turning to Raph, Leo commends his brother's anger-fulled strength, asking him to use it to help them by going "as loud as you can". Amped up by his brother's speech, Raph races over to an crashed Pizza van and single-handedly lifts it back onto its wheels. Their spirits rejuvenated, the quartet pile into the van as Raph commends Leo for his superb leadership moment.
- Raph:You know, just then, for the first time in your life...you didn't sound lame. You actually sounded like a leader.
Leo: I do? Oh, I do!! Oh, I sound like such a leader, holy crap, that's so dope!
Raph: Aaaand you ruined it.
As the van tears through the ruined streets, April digs her way out of the rubble nearby, commenting on how good an investment her bike helmet turned out to be. Seeing the anti-mutant broadcast on the billboards nearby as well, she notices a nearby channel 6 news station.
- April: Not on my watch.
As she makes her way into the studio, pushing past all the fleeing reporters and news crew from SuperDuperFly rampaging just outside the building, April bursts into the studio just as the newscaster flees the broadcast as the building partially collapses. Despite her anxiety and old trauma returning once more when she realizes she's back in front of a live camera crew again, April manages to control herself to deliver the correct series of events to New York (minus a little vomiting), outlining that the only mutant they need to fear is SuperDuperFly, and the others are risking their lives to stop him.
As the Turtles' van zooms through the wreaked streets, Scumbug swoops down, carrying Splinter in her arms to deliver to rodent atop the moving van. Explaining that he can converse with the cockroach mutant quite well due to them both speaking "vermin" (and casually admitting he's very attracted to her), Splinter directs Donnie to drive to the top of a nearby parking garage, putting them at optimal height to jump the van straight over the passing SuperDuperFly's head and letting Mikey drop the canister into his blowhole. Before he can release the missile however, SuperDuperFly notices the mid-air van above his head from the reflection in a nearby glass skyscraper, swiftly turning around and catching it. Ripping the top off the van, he seizes the Turtles in his claw arm, causing Micky to drop the canister. Though Splinter manages to jump from the falling van to catch the anti-mutagen, he's left wide open to SuperDuperFly backhanding him several blocks away, landing painfully and left lying prone on the ground. Angered by their repeated interference with his anti-human campaign, SuperDuperFly declares that he's done with the Turtles, mocking them that they'll never be capable of stopping him, or getting accepted by humans, before using his claw arm as a lever to start crushing the teenagers, wanting to crack their shells "like pistachios". As the pressure mounts and their demise seems imminent, Raph takes back his earlier statement, admitting that he's happy his last sight will be his brother's faces.
Splinter regains consciousness, still badly wounded, his groggy perception eventually making out the sight of SuperDuperFly slowly crushing his family to death. Desperate to help them, Splinter attempts to stand, only to collapse to the ground, his leg broken from the fall. Vainly, he tries to drag himself towards the anti-mutagen canister to try and help his sons, only to notice a human figure approaching him through the dust and smoky chaos of the city. Traumatic memories of the human mob that attacked them on their first outing rushing through his head, Splinter can only fearfully back away from this menacing figure, choking back tears as he tries weakly to beg him not to hurt him, as the figure raises a clenched fist towards him... and uncurls it into a helping hand.
- Civilian: Hey, are you ok? do you need help?
Confused, Splinter looks around as more humans crowd around him offering aid, before his gaze falls on April's live broadcast on the billboards, the news changed to now support the Turtles and the mutants as heroes fighting against SuperDuperFly. Realizing he doesn't need to fear them anymore, Splinter begs the citizens to get the anti-mutagen canister to his sons, with one of them dropping it in a plastic carrier bag for easy carrying before running down the street towards SuperDuperFly's attempted execution. Seeing the humans trying to aid the Turtles makes the Super-Mutant pause before trying to thwart the nameless helper, tossing more cars his way. Before he can be crushed, Genghis Frog hops in to give him a piggy-back ride through the projectiles, dodging several of them before SuperDuperFly blocks their way with a thrown bus. At that moment, a New York cab driver speeds by, yelling to the civilian to pass him the canister instead, as he takes up the charge instead. SuperDuperFly again collapses the street in front of the cab with a thrown projectile, only for Wingnut and Scumbug to lift the whole vehicle over the blockade. When another projectile knocks the cab from their grip, Bebop and Rocksteady safely catch it, passing the canister onto Mondo Gecko who, with the aid of some scarer hoodlums, is able to weave his way past SuperDuperFly's barrage, underneath his legs before accidentally falling into a broken storm drain that's flooded the streets behind him... allowing Ray Fillet to swim in and pass the canister from Mondo onto a tower crane operator riding the hook towards the Turtles.
As SuperDuperFly is stumped by the seamless cooperation between mutant and human against him, he's unexpectedly hurt by a bulldozer ramming into his leg, followed swiftly by multiple other vehicles driven by New Yorkers united against him slamming into his reachable limbs. The pain makes him release his death grip on the Turtles, making them desperately scramble to keep ahold of his massive body as the Kaiju Mutant is further distracted by more civilians opening the apartment windows around him to throw whatever they can lay their hands on onto his head. No freed, the Turtles use their acrobatic skills and teamwork to Parkour around the nearby buildings and the Super-Mutant's body, passing the canister from one to the other until Leo is finally able to slice the bag open and drop the canister into SuperDuperFly's blowhole, the teenagers triumphantly posing around the Ooze-spewing orifice at their success.
Coughing mutagen from his mouth as the canister starts to take effect, SuperDuperFly defiantly tries to get the last word in.
- SuperDuperFly: Damn! You think this the end of me? man, you know what-
However, he doesn't get to finish. His mega-mutant body is enveloped in a blue light as the anti-mutagen takes violent effect, the various animals that formed his body rushing off into the city streets, the main whale body landing safely into the flooded section of the city, leaving no trace of the original mutant fly behind.
As the sun rises and everyone takes stock of the chaos, the civilians start to applaud the Turtles for their efforts, to their rising delight, as they realise they they finally succeeded in being recognised as non-dangerous to the general public. As April joyfully exults in her successful reporting on the watching cameras, the rest of the mutants emerge from the rubble, getting applauded as heroes as well. Splinter bashfully puts the offer to Scumbug to join him down in the Sewer home, with the insect mutant giving him a (disgusting) kiss in response.
Soon after, the Mutants move into the sewers with the Turtles and Splinter, settling in to life in the lair. Ray Fillet enjoying the tunnels' acoustics, Mondo performing pipe tricks on his skateboard as recorded by Genghis, Wingnut enjoying reading through Donnie's manga collection, Bebop and Rocksteady arguing over where the couch should go and Leatherhead cooking dinner for them. Splinter and Scumbag make packed lunches for the Teenagers, now wearing their human clothes in preparation for their first day in the human world above ground. Reassuring his sons that they can come to him for aid if they run into trouble (and the rest of their extended family will join in) the teenagers reassure him that Splinter's prepared them for this moment their whole lives. After reaffirming their family love for each other, the turtles venture up top, leaving their father with their trademark face-obscuring headgear as they head out to Eastman High, just as normal teenagers. Despite initial trepidation, the student body warmly welcomes the heroic teens, and the quartet catch up with April as she shows them around, walking past her locker as they do so, the graffiti on it now re-named to "April O'hero"...
In a mid-credit scene, the Turtles are shown enjoying high school life: Michelangelo is participating in the school's comedy improv team just like he wanted, Raphael has joined the wrestling team to focus his aggression into healthier interests, Donatello has found the computer club ("My people!"), and Leonardo helping April out with her journalistic interests as her cameraman. April's next focus is TCRI, whose offices were mysteriously cleaned out following the aftermath of SuperDuperFly's rampage, all personnel vanished without a trace. However, April (and Leo) vows to track them down wherever they've gone to ground. Once the recording's done, Leo bashfully and awkwardly asks April that, prom being back on and all, if she'd be willing to go to the dance with him. April accepts (though under the opinion that it's just as friends). Later on at the dance, as the four turtles mess around and socialise with their fellow teenagers, they are unknowingly watched by a secret spy camera, monitored by Cynthia Utrom, nearby a sealed containment jar containing a buzzing fly — all that remains of Superfly after the anti-mutagen affected him. Cynthia comments that finding the Turtles will be much easier than expected; capturing them, with the approval of the public behind them however, will be much less so. The Squad Leader speaks up, noting that they do have one option...
- Cynthia Utron: (Slasher Smile) Yes, I know. Bring me....The Shredder.
On a rainy night, a thunderstorm illuminates a figure watching the city of New York, his visage obscured with a very familiar looking spiked helm...
