Wally begins his new training regime under Barry in an attempt to increase his speed, when a Meta with a killer touch makes his presence known in Central City, and Iris could be one of his potential victims.
- Alternate History: We learn more about the history of Earth-19. Al Capone was Vice Presidentnote , gambling is illegal, and Abraham Lincoln is on the one-hundred dollar bill instead of Benjamin Franklin.
- Antagonist Title: Referring to the Villain of the Week and his powers.
- Arc Words:Barry: Run, Wally, run!
- Back for the Dead: Julio Mendez returns, just in time to get the axe from Yorkin.
- Badass in Distress: Under any other circumstance, Iris would have been okay, given her quick reaction when trying to knock Yorkin out with a vase. It's too bad any object Yorkin touches instantly disintegrates.
- Brought Down to Normal: Wally is able to negate Yorkin's powers by phasing his blood into Yorkin.
- Brutal Honesty: Julian tells Caitlin that everybody should stand up for what he/she did and not make excuses, in regards to his deeds as Alchemy and her deeds as Killer Frost.
- The Bus Came Back: Julio Mendez (see above) and Jesse Quick return.
- But for Me, It Was Tuesday: At first, Joe isn't too concerned about Yorkin, because they have faced worse metahumans before.
- …But He Sounds Handsome: Wally sure loves hearing Kid Flash getting praises.
- Celebrity Paradox:
- Cisco and HR compare Julian and Caitlin working on the corpse of Yorkin's first victim as like watching an episode of CSI. Megalyn Echikunwoke (Vixen's Mari McCabe) was a main cast member on CSI: Miami, while Kelly Hu (Arrow's China White) played a Recurring Character on CSI: NY.
- Cisco quotes The Hunger Games ( "May the odds be ever in your favor"). Robert Knepper (William Tockman) played a villain in the film adaptation's last two films.
- Continuity Nod:
- Barry realizes that Yorkin's first two victims are his coworkers from Flashpoint.
- When Yorkin barges in on Iris in their loft, she activates the Meta-Alarm app on her phone that Cisco installed in all of Team Flash's phones. Later Joe uses the alarm again when the train he is on is headed for a collision.
- Barry mentions that Cisco offered to supply Barry and Iris a custom security door like at STAR Labs for their loft, but the two agree that the deadbolts are just fine, given STAR Labs' many lapses in security.
- While her daughter is #TeamKidFlash, Cecile is #TeamFlash, which makes sense when you remember her admission to Barry from "Who Is Harrison Wells?"
Cecile: (from Who is Harrison Wells?) You know I saw the Flash once. I was on my way to the courthouse. He blew past me, it was just a blur of red and a gust of wind. Still it was pretty damn cool!- With the reveal of Yorkin, all but one of the known husks resulting from Alchemy giving people metahuman powers has been accounted for (five husks/Shade, The Rival, Magenta, Yorkin). Julian mentions there's one metahuman still unidentified who he considers it his responsibility to find.
- Barry mentions all his mentors to Wally.
- A Day in the Limelight: Wally is given more chances to shine and gain more self-confidence and the ability to phase through solid objects, given that Barry is preparing Wally for the stand off against Savitar for Iris' life.
- Demoted to Extra: Julio Mendez, who was one of the Power Trio of the previous Flash series. In the Flashpoint timeline, he was Kicked Upstairs to be Da Chief of CCPD. Now, he's the second Victim of the Week.
- De-power: Wally phases through Yorkin, his blood countering Yorkin's powers and rendering him human.
- Evil Is Petty: Yorkin goes after everyone who wronged him (as in, put him behind bars for his criminal deeds) even though it wasn't even in this timeline.
- Failure Hero: Wally is devastated when Iris is infected by Yorkin.
- Fandom Rivalry: In-universe, the Wests are quite amused that Cecille and her daughter are vocal on discussing which Flash is better.
- Gotta Kill Them All: Yorkin seems to be after people who are law enforcers in the Flashpoint timeline.
- "I Know You're in There Somewhere" Fight: Julian does this with Caitlin when Killer Frost starts taking over.
- Immune to Bullets: Bullets don't work on Yorkin, as like everything else they just dissintegrate harmlessly.
- Insufferable Genius: By working with Julian, Caitlin begins to realize why Barry always complained about sharing an office with him.
- Internal Reveal: Iris finally lets Joe in on the Bad Future.
- It's All My Fault:
- Wally blames himself when he's not fast enough to stop Yorkin from infecting Iris.
- Julian blames himself for giving Yorkin powers in the first place as Alchemy.
- Make Them Rot: Clive Yorkin's power causes anything he touches to rot and disintegrate.
- My God, What Have I Done?: Julian's reaction when learning that Alchemy created Yorkin.
- Mythology Gag: Clive Yorkin almost killing Iris. In the comics, he was the prime suspect in Iris' murder until it's revealed the true culprit was Eobard Thawne.
- No Name Given: Yorkin holds the distinction to being the first Meta Cisco note hasn't assigned a nickname to.
- Not So Stoic: Iris voices her fears when she and Barry encounter another event from the Bad Future news ticker.
- Oh, Crap!: Yorkin, in typical supervillain fashion, loses his cool when he realizes Wally has disabled his powers.
- Remember the New Guy?: The only Flashpoint CCPD officer that Barry actually met in the actual Flashpoint episode was Julio Mendez. The first Victim of the Week and the retired cop turned private investigator made their first appearances here.
- Revenge by Proxy: Yorkin goes after Iris, figuring watching her die would be more painful for Joe than just his own death.
- Say My Name: Barry tries to make Wally call him the "Fastest Man Alive" after their race. It is not shown if he succeeds.Barry: What's my name?
- Sequel Hook: The Stinger leads directly into the following episode's plot.
- Ship Tease: Caitlin asks if Julian would like to join her for drinks to which he enthusiastically responds yes.
- The Stinger: Wally is practicing his phasing ability when Jesse arrives from Earth-2, and reveals that Harry's been abducted by Grodd, and she needs help getting him back from Gorilla City.
- Superpowered Evil Side: When Caitlin taps into her powers to slow down Iris' infection, Killer Frost briefly takes over and considers letting Iris die, until Julian talks her down.
- True Companions: After the infection has been contained, Iris thanks Caitlin, knowing full well what she risked to save her life.
- Unskilled, but Strong: The episode emphasises the fact that Wally has the potential of being Barry's Superior Successor, being already just as fast as him, but still needs the same training and experience the latter has.
- What Happened to the Mouse?: Guess the girlfriend Julian mentioned in "Shade" is no longer in the picture, given his excitement when Caitlin invites him out for drinks.
- What the Hell, Hero?: When Joe learns about Iris' death, he lets loose on The Team for keeping it from him.
- Would Hit a Girl: Yorkin attacks Iris as Revenge by Proxy for Joe. His final target is also a retired female cop.
- You Are Better Than You Think You Are: When Caitlin worries that she will end up hurting Iris and lose control while trying to fight off the decaying infection with her ice powers, Iris assures Caitlin she believes in her ability to keep Killer Frost at bay.
- When Killer Frost does indeed begin taking over Caitlin, Julian is able to talk her down, insisting she's stronger than he was, and unlike him and Alchemy, she can keep Killer Frost from coming forward.
- Later Caitlin repays the favor by asserting that Julian isn't weak, and that it was his strength kept her from going completely Killer Frost, asserting that The Team would be more appreciative if he would start dropping the Jerkass act more often like she knows he can.
