"You ruined my life! All of our lives!"
—Barry Allen screaming at Eobard Thawne
"The Trap" is the twentieth episode of the first season of The Flash, and the twentieth episode overall. It aired on April 28, 2015.


Barry, Caitlin, Cisco and Joe set a trap for Wells. Cisco uses himself as prey which puts him in grave danger. Meanwhile, Eddie makes a decision regarding Iris, which leaves Joe a bit unsettled.[1]


Preparation ran from February 13 until February 23, 2015. Shooting ran from February 24 until March 6, 2015.[2]


  • Gideon reveals that at some point in the future, Barry gets promoted as director of the Central City Police Department's CSI division, and Barry created her.
  • Gideon mentions to Barry that he is "a founding member of ...", but is interrupted by the latter (before she can finish her sentence) who wants to know what she is, however, in a comic preview of the same scene, Gideon is interrupted after stating the word "justice". It is implied that he is a founding member of the Justice League or a future incarnation of the Justice Society.[3]
  • In the future newspaper, it is shown that, for some reason, the present-day Star City had its old name (Starling City) in the future. This might be somehow related to changes in the timeline and, maybe due to a butterfly effect (caused by Eobard Thawne's time travel), the city had its name changed. This could also be a mistake made by the producers of the show.
  • Cisco calls Gideon "Hal", a reference to HAL 9000 from the 1968 film 2001: A Space Odyssey.
  • Before entering his lucid dream, Cisco asks if it was like the 2010 film Inception or the 1984 film Dreamscape
  • In the flashback, as Thawne/Wells talks to an unconscious Barry, he is shown vibrating his hand, even though he had lost his powers at that point.
  • This was the last episode that Gideon appeared in the present chronologically, until the Season 4 episode, "Null and Annoyed".




  1. Flash Episode 20 "The Trap" Description - FlashTVNews
  2. Andrew Kresiberg (@AJKreisberg) - Twitter
  3. Flash, Gideon. Gideon, Flash.- Twitter