The Loop (TV)
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- "I know from being in the Speed Force that the universe is with us, not Zoom. And if the universe is with us, how can we possibly lose?"
- —Barry to Caitlin after she returns to S.T.A.R. Labs
|After Zoom unleashes an army of Earth-2 meta-humans on Central City, Barry is shaken when he sees their leader is the Black Canary's Earth-2 doppelgänger, the Black Siren. Meanwhile, Wally takes to the streets to help The Flash stop the meta-humans, which worries Joe. Iris and Henry are concerned about Barry taking on Zoom.|
- Grant Gustin as Barry Allen/The Flash
- Candice Patton as Iris West
- Danielle Panabaker as Dr. Caitlin Snow
- Carlos Valdes as Cisco Ramon/Vibe
- Keiynan Lonsdale as Wally West
- Tom Cavanagh as Dr. Harry Wells
- Jesse L. Martin as Detective Joe West
Special guest star
- Teddy Sears as Hunter Zolomon/Zoom
- Violett Beane as Jesse Wells
- Amanda Pays as Tina McGee
- Patrick Sabongui as David Singh
- John Wesley Shipp as Henry Allen
- Rhys Williams as Man
- The meta-human who emits purple energy from his eyes and hands that Wally fights could possibly be a reference to Pathfinder, a comic book villain with similar powers.
- This episode marks the very first appearance of Laurel Lance/Black Siren of Earth-2. She returns in 's "" as a recurring character for the duration of the fifth season, and then as a series regular in Arrow from the sixth season onwards.
- Throughout the episode, Henry Allen and Tina McGee develop a friendship between each other. This is the reference to the roles of John Wesley Shipp and Amanda Pays as Barry Allen/The Flash and Tina McGee respectively in the 1990 TV series , in which they eventually became a couple.
- Black Siren says, "Bye, bye, birdie" in response to Earth-1 Laurel's death, referencing the 1958 Broadway musical and 1963 film of the same name.
- When Cisco sees the dead birds, he mentions feeling like he's in a Hitchcock movie, precisely The Birds.
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