As Barry tries to cope with life without his powers, a new meta-human emerges who wants Wells to cure him.
Tropes:
- Abhorrent Admirer: Now that she knows who he is, Caitlin is repulsed and disturbed by Hunter/Zoom being obsessed with her.
- Actually Pretty Funny: Jesse can't help but laugh at Joe's snarky "What so he's got to increase his blueberry uptake?" line, when she tells him that Grey is dying from too much oxidants in his systems.
- All Women Are Prudes: Killer Frost snarks at Caitlin's dress sense.
- Arson, Murder, and Jaywalking: Frost talks Caitlin into freeing her by claiming that Frost can help her out of Zoom's lair. She also adds that she can also give Caitlin some fashion tips while they're at it.
- Alternate Timeline:
- Killer Frost had a younger brother while Caitlin never had one as far as she knows. She also flunked med school.
- Barring Eobard Thawne altering Earth-1's timeline, the wife of Harrison Wells dies not to witness the Particle Accelerator creating metahumans.
- Ambiguous Situation: After Griffin Grey has finally exerted himself past the breaking point, he collapses and reverts to his younger self. We don't know if he's merely unconscious (which would mean he's finally cured), or if it's an example of Dying as Yourself.
- And Your Little Dog, Too!: Zoom threatens to kill the Man in the Mask if Caitlin tries to free him like she did Killer Frost.
- Badass in Distress: It turns out that Zoom didn't kill Frost and instead locked her up in one of his prisons specifically build to negate her powers.
- Back for the Dead: Killer Frost is killed by Zoom because she tried to kill Caitlin.
- Blessed with Suck: Griffin Grey has Super-Strength, but the more he exerts his power, the faster he ages.
- Brought Down to Badass: Barry did not lose his courage despite losing his Super-Speed first by participating in Harry's rescue mission from Griffin Grey, then by taking down Griffin himself with nothing more than a slightly and temporarily upgraded Flash suit.
- Brought Down to Normal: Despite the above, this is Barry's main dilemma for the entire episode.
- The Bus Came Back: This episode features the returns of Jesse and Killer Frost, the latter of whom many fans thought was killed by Zoom. Which she is later in this episode.
- Can't Kill You, Still Need You: Killer Frost's reasoning for why Zoom hasn't killed either her or The Masked Man yet, not that she's planning to stick around long enough to find out.
- Cast from Lifespan: Griffin's super-strength causes Rapid Aging - he's 18, but already looks more than a decade older.
- Cell Phones Are Useless: People from Earth-2 cause this to happen in localized areas on Earth-1, due to the fact that they vibrate at a different frequency. This is how Wells tracks down Jesse.
- Damsel out of Distress: Caitlin attempted to free herself from Zoom's clutches with the help of her Earth-2 counterpart. Unfortunately, Killer Frost is an Ungrateful Bastard.
- Deal with the Devil: Caitlin makes one with Killer Frost so she can help her escape. Unsurprisingly Killer Frost lied.
- Didn't Think This Through: Upon realizing that Zoom kept her around as a Replacement Goldfish for Earth-1 Caitlin, Killer Frost decides it'd be a good idea to try a Kill and Replace on her counterpart. This isn't a bad plan in theory, but knowing what Zoom does to people who cross him, she would have done well to at least escape Zoom's lair before attempting it. She doesn't and Zoom shows up a within minutes to give her some Laser-Guided Karma.
- Enemy Mine: Killer Frost proposes to Caitlin that if Caitlin breaks Frost out of her cell, Frost will help Caitlin escape from Earth-2. Except Killer Frost didn't honor her deal.
- Genius Bruiser: Turns out that Griffin isn't a Dumb Muscle because he knows enough chemistry to know that Harry was only distilling a solution instead of working on a proper cure.
- Heel Realization: Being kidnapped by Griffin makes Harry deal face to face with his actions and how he needs to atone for them.
- Idiot Ball: While it's excusable since she was desperate, Caitlin probably should have expected that the Evil Twin she was warned about would turn out to be untrustworthy. Although to be fair, she knew that Killer Frost had helped Barry and company earlier.
- I Just Want to Be Normal: Griffin Grey realizes that he is Blessed with Suck, so he kidnaps Harry so he can create a cure.
- Impaled with Extreme Prejudice: Zoom stabs Killer Frost with her own icicle after she attempted to kill Caitlin.
- In Spite of a Nail:
- Caitlin and Killer Frost's mothers are both "bitches".
- Barring the original Earth-1 timeline until Eobard Thawne messed it up, the wife of Harrison Wells still ends up dying.
- Intangibility: Zoom phases through Caitlin to stop and redirect Killer Frost's icicle.
- Irony: Wells tells Griffin Grey that metahuman transformations from the particle accelerator are irreversible, despite the fact that Barry has once again become human.
- I Owe You My Life: Wally badly wants to meet The Flash for saving his life twice.
- Jerkass Woobie: In-Universe, Griffin. He wasn't a bad person but he really got the short end of the metahuman lottery, and he desperately wants to be normal again.
- Laser-Guided Karma: Zoom kills Killer Frost mere moments after the latter betrays her deal with Caitlin.
- Meaningful Name: Griffin Grey turns into an old man with graying hair.
- Multiversal Conqueror: What Zoom intends to become now that he has solved his issue of You See, I'm Dying.Zoom: You know, I've always measured my success by the counting the number of victims I've had. But now I think I'm going to widen my scope and start counting the number of Earths I conquer instead.
- Mythology Gag:
- Harry says he's gonna help Barry get his powers backs by recreating the particle accelerator explosion is taken straight out of Flashpoint, where that timeline's Batman helps Barry get his powers back in the Flashpoint!Timeline by recreating the famous lighting bolt-induced chemical bath with a lightning-powered electric chair surrounded by the same chemicals.
- Griffin steals from Ace Chemical, and his hideout is an abandoned amusement park, like the Joker's in Batman: Mask of the Phantasm.
- Nice Job Breaking It, Hero:
- Harry is quick to point out how stupid it was that Barry gave up his speed to Zoom. While completely ignoring his own part in it which the other members of Team Flash are quick to call him out on it.
- Caitlin inadvertently inspires Zoom to be a conqueror.
- No Ontological Inertia: When Griffin dies of old age, he turns back into a teenager.
- Oblivious Guilt Slinging: The reason why Zoom didn't kill Killer Frost was because she reminds him of Caitlin, but once she tries to kill Caitlin he stops using that as an excuse to keep her around.
- Out of Order: The Flash Forward to the grave of Arrow Season 4 shows Barry having his Super-Speed. However, said funeral episode takes place to the Arrow episode following this one, and Harry just thought of how to reclaim Barry's speed during The Stinger of this episode.
- "The Reason You Suck" Speech: Griffin blames Wells for ruining many people's peaceful lives with the Particle Accelerator. Granted, it was directed at the selfishness from Eobard Thawne, but nonetheless a valid complaint.
- Replacement Goldfish: Killer Frost realizes the reason Zoom didn't kill her is that she looks like Earth-1 Caitlin.
- Right for the Wrong Reasons: Grey Griffin's above speech was about the Earth-1 Wells/Thawne, but it still rings true with Harry's actions on Earth-2.
- Rogues' Gallery Transplant: Griffin is a Flash villain, yes, but from Bart Allen's brief tenure as the Flash.
- Sequel Escalation: It no longer just ruling the Central City of both worlds that's enough for Hunter, it all worlds.
- Shout-Out: Cisco compares Griffin to He-Man.
- Slasher Smile: Zoom delivers a down right manic one when gloating to Caitlin about granting her request.
- Stockholm Syndrome: Zoom wants to invoke this Caitlin so she'll love him.
- Too Slow: Griffin to Barry. Oh, the irony...
- Tragic Villain: Griffin Grey was a teenager gifted with super-strength...which came with a side of rapid aging.
- Troubled Backstory Flashback: Everything Caitlin says seems to remind Zoom of the night his mom died.
- Villain Has a Point: Caitlin may be scared that Hunter killed her alternate counterpart, but Hunter accurately says that if he hadn't intervened, Killer Frost would have killed her.
- Villainous Legacy: In case you needed another reminder of how much of a dick Eobard Thawne was, look no further than Griffin Grey's plight. At least with Earth-2 Wells the particle accelerator explosion was an accident, not deliberate.
- Vocal Dissonance: It's kinda creepy when Hunter, with his mask and thus the demonic voice still on, tells Caitlin that she needs to eat.
- Wham Line: A big one from Harry at the end.Harry: You are gonna get your speed back, Allen. And I'm gonna help you do that, by creating another particle accelerator explosion.
- Also Zoom finally agrees to Caitlin's pleas to let her go home.
Zoom: You know I've always measured my success by counting the number of victims I've had. But now I think I'm going to widen my scope, and start counting the number of Earths I conquer. You want to go home? Then let's, after all this Earth's already been brought to it's knees. - You Are Better Than You Think You Are: When Barry and Iris are remembering the first time he saved her with his speed, he mentions now he has no idea who he is anymore without his speed. Iris assures him that speed or no speed Barry Allen is a hero.
