"The Devil's Greatest Trick" is the thirteenth episode of the sixth season of Arrow, and the one-hundred-twenty-eighth episode overall. It aired on February 8, 2018.


Cayden James discovers a secret about Green Arrow that pushes him over the edge. Knowing everyone and everything he loves is in danger, Oliver must decide if he can do this alone or if he needs to turn to his old teammates for help. William starts to demand more of Oliver's time.[1]




  • Barry Allen makes a cameo in this episode. Oliver has Barry rush him and John to meet Cayden James before he leaves the city.
    • This is the first time that John did not vomit while being carried by a speedster.
      • However, Oliver had asked Barry beforehand to quickly take them to meet Cayden James. Thus, John would've prepared be transported at super speed, possibly by taking medication to prevent motion sickness.
  • This episode possibly takes place after the events of The Flash episode "True Colors", in which Barry was released from prison.
  • This is the first time since "The Trial of The Flash" where Barry appears on-screen as The Flash.
  • Black Siren can be seen wearing one of the power-dampening collars that was shown in the Crisis on Earth-X crossover, having then been used by the Earth-X Nazis to suppress the powers of meta-human prisoners, as well as to deliver a painful electric shock to any inmate trying to escape.[2]
  • The title of this episode refers to the major twist at the end where it was revealed that Ricardo Diaz is revealed to be the true murderer of Cayden's son and the mastermind of the events of season 6.
  • Katie Cassidy, David Nykl, Kacey Rohl and Jack Moore previously appeared on Supernatural.


  1. Arrow Spoilers: “The Devil’s Greatest Trick” Description - GreenArrowTV
  2. "Crisis on Earth-X, Part 3"