The Turtles get their first look at high school when April's school project draws attention from Kraang.
This episode provides examples of:
- Agony of the Feet: Master Splinter jabs his walking stick into Leo in the foot as punishment for trusting Karai.
- All Your Powers Combined: Justin, the super mutant, has abilities taken from various animals, including an octopus, an electric eel, and a cobra.
- Arson, Murder, and Jaywalking: In addition to the all of the above, the super mutant inherited a cat's meowing.
- Continuity Nod: April didn't say she tried to warn Leo for nothing.
- Create Your Own Villain: Justin was created by Karai when she caused all of the Kraang's harvested DNA to fuse into one monster.
- Cryptic Conversation: Raph and Leo have a veiled argument about Karai in front of a baffled Donnie and Mikey, who don't yet know of her.Raph: I thought I saw something. What about you, Leo? Did you see something?
Leo: No.
Raph: Turtles first, right?
Leo: Turtles first.
Donnie: You feel like we're missing something?
Mikey: All the time. - Curb-Stomp Battle: Justin does this to the Turtles and the Kraang before Leo's finally able to take it down.
- Eldritch Abomination: Justin.
- Enemy Mine: Karai briefly with the turtles against the Kraang, but then subverted when she abandons the turtles to fight the Eldritch Abomination that shows up.
- Then it's the Kraang and the Turtles against said Abomination, as Raph is quick to throw in Leo's face.
- Fluffy the Terrible: Mikey calling the mishmash mutant monster "Justin", if only because his other idea wasn't good enough.
- Foreshadowing:
- Whether this was unintentional or not, there is a picture of a snake on the mutation board that Karai used to create Justin. Ironic considering this is the type of mutant that Karai turns into a season later.
- Not only that, but before that Karai asks how the mutagen works. Raph sarcastically tells her to lean in closer and find out.
- Despite the fact that they've only seemed to need Kirby for most of the season, the Kraang have started targeting April. Two episodes later, we'll find out it was her they were really after, not Kirby.
- Whether this was unintentional or not, there is a picture of a snake on the mutation board that Karai used to create Justin. Ironic considering this is the type of mutant that Karai turns into a season later.
- Girly Scream: Mikey, freaking out about the cat DNA being absorbed, just before Justin is born.
- High School: For about two scenes.
- The Hyena: Bradford just can't stop laughing at Xever's mishaps with Stockman's electronic legs.
- I Told You So: During Leo's confession about Karai, April states that she warned him about her.Raph: You too, huh?
- Kick the Dog: Karai abandons the Turtles to fight an Eldritch Abomination she accidentally created, which causes Leo to give up on her.
- Jerkass Has a Point: Raph tells Leo that the only reason Karai didn't attack them is because she's studying their moves.
- Jerk with a Heart of Jerk: Karai.
- Lack of Empathy: As stated above, Karai abandons the Turtles even though the Eldritch Abomination attacking them was her own fault, and when Leo points out that he trusted her, she mocks him.
- Never Trust a Trailer: The official promo for this episode shows the Turtles as they face "face their toughest decision ever"; pizza omelette or omelette pizza. There's exactly one shot of the Turtles arriving at April's school.
- The promos and the official description also don't indicate at Karai's role in the episode and the Turtles' attack on the Kraang's WWGP lab.
- Not Helping Your Case: Leo tries to argue that it was just Karai watching them, not the Foot. Raph is quick to point out that Karai is the Foot.
- Odd Name Out: The super mutant was given the name "Justin" because Mikey couldn't think of a better name to give it.
- Red Eyes, Take Warning: Mrs. Campbell
- Redundant Romance Attempt: When Leo spots Karai watching the Turtles' fight, he starts showing off and exaggerating the danger, to the confusion of Donnie and Mikey, and irritation of Raph.
- Revenge Before Reason: Shredder. However, he changes his tune after Karai gives him a working piece of Kraang technology.
- Rousseau Was Right: Cruelly subverted. Karai abandoning the turtles to a monster she created causes Leo to give up on her.
- Shock and Awe: Justin's eyes are electrified!
- Silly Rabbit, Idealism Is for Kids!: Leo's beliefs that there was good in Karai are proven to be completely false.Leo: I trusted you!
Karai: I know, messed up right? - Tempting Fate: After Splinter gently chastises Leo, he thanks him for not being mad. Que Splinter driving his walking stick into Leo's foot.
- Trailers Always Spoil: A preview clip shows April being chased around the school by Ms. Campbell, who turns out to be a Kraang robot.
