"A good friend of mine told me that if you're going to try to fight fire with fire, you're gonna get burned, but then another friend of mine came through something pretty scary tonight because he had backup, a team."
Felicity Smoak to Alena Whitlock when joining Helix
"Fighting Fire With Fire" is the fifteenth episode of the fifth season of Arrow, and the one-hundred-seventh episode overall. It aired on March 1, 2017.


Oliver faces his biggest challenge yet as mayor. Felicity continues down her dark path with Helix. After Vigilante attacks Oliver while he's acting as the mayor, Diggle leads the team in a mission to stop Vigilante once and for all.[src]


Preparation ran from December 12, 2016 until January 5, 2017. Shooting ran from January 6 until January 17, 2017.[1]


  • The title comes from a line Diggle told Felicity regarding her involvement with Helix and what Oliver told Thea about her involvement in dirty politics. Felicity acknowledges this line whilst talking with Alena.
  • After this episode, Thea isn't seen again until "Honor Thy Fathers", six episodes later.




  1. Marc Guggenheim (@mguggenheim) - Twitter
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