"Oh... I'm ten steps ahead of you and you haven't even figured out what game we're playing yet."
Adrian Chase/Prometheus gloating to Oliver about his plan
"Checkmate" is the sixteenth episode of the fifth season of Arrow, and the one-hundred-eighth episode overall. It aired on March 15, 2017.


Oliver gets closer to the truth about Prometheus. Meanwhile, Helix refuses to continue helping Felicity until she does a favor for them.[src]


Preparation ran from January 9, 2016 until January 17, 2017. Shooting ran from January 18 until January 27, 2017.[1]


  • The episode title comes from Chase outsmarting Oliver in every turn, claiming he is "ten steps ahead". Oliver also admits that Chase has them in check.
  • Oliver and the rest of Team Arrow find out that Adrian Chase is Prometheus.
  • When Curtis and Dinah go to find Adrian's mother, Amanda Westfield, in Opal City, they see her house is empty and Curtis says, "--Norma Bates got the hell out of dodge". This is a reference to the mother of serial killer Norman Bates from the Psycho film series.
  • This is the first appearance of Talia al Ghul in Season 5 in the present day rather than flashbacks.
  • In the flashbacks, Oliver mentions that he doesn't know anyone who could get data off a bullet-ridden laptop, referencing what he asks Felicity to do in the Season 1 episode "Lone Gunmen"​​​.




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