Caitlin's mother Dr. Tannhauser runs some tests on her cold powers in episode 3x05 "Monster".
Barry and Wally go to stop Ramsey Deacon but he manages to take control of Barry's fancy new suit in episode 4x02 "Mixed Signals".
Vanessa Jansen crushes Bobby Moretti into a tiny cube and steals his guns. Nora shows up when Barry is investigating the scene and he has to pass her off as his new intern to Captain Singh in episode 5x02 "Blocked".
Cicada changes into his work clothes and thinks back to the murder of Gridlock earlier in the evening in episode 5x02 "Blocked".
The team tracks down Laura Washington who stole the device they need to use the alien tech and Rene confronts her with Barry & Kara in episode 5x08 "Invasion!".
Diggle and the team attempt to foil a robbery of some medicine only to find the thieves are Bratva led by Anatoly and sent by Oliver in episode 5x18 "Disbanded".
Oliver leads the team in stopping Anatoly's second medicine heist in episode 5x18 "Disbanded".
Felicity and Curtis break into a tech company to steal the tool they need to decrypt Chase's image scrambler in episode 5x18 "Disbanded".
Oliver, Anatoly, and the Bratva break into a medical company to steal some medicine for the sick children in episode 5x18 "Disbanded".
Black Siren breaks into a lab under the guidance of Cayden James and steals some Nano-Termite in episode 6x07 "Thanksgiving".
The team tracks Black Siren to a second robbery but Diggle has a medical incident during their attempt to stop her in episode 6x07 "Thanksgiving".
A group of researchers in the arctic find a frozen wolf body and something goes terribly wrong when they go to dissect it leading to the D.E.O.'s investigation in episode 2x06 "Changing".
Dr. Jones heads back to his lab after being rescued by the DEO and kills his boss who wants to fire him in episode 2x06 "Changing".
James interrupts a deal between Brian and his drug dealer and squeezes some information about the attack on the square from him in episode 2x20 "City of Lost Children".
James, Winn, and the alien refugees leave their hideout to watch the spacecraft flying over the city in episode 2x20 "City of Lost Children".
Kara finds Thomas Coville beneath the stadium with the Kryptonian pod set to detonate in episode 3x04 "The Faithful".
Source: What's Filming
Kara arrives at a robbery by the Children of Liberty in time to save Manchester from being shot in episode 4x07 "Rather the Fallen Angel".