"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]


Main Cast

Guest Starring




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.
  • The restaurant that Curtis and Paul meet up at is the same set for CC Jitters from The Flash.
  • The team tracks Vigilante to a building directly across from City Hall where Oliver is about to give a speech. Rene states, "It's Vigilante's book depository." When Felicity says the 6th floor is under renovation, Diggle realizes that's where Vigilante will be. These are references to the JFK assassination; Lee Harvey Oswald was also on the 6th floor of the Texas School Book Depository in when he shot Kennedy.


  • The team tracks Vigilante to the building across from City Hall, within hearing range, where Oliver is addressing the press. Vigilante fires on Team Arrow with an automatic weapon, multiple times, yet no one at the press conference reacts to the sound of gunfire.
  • A laptop wouldn't contain a bank transfer because the transfer information is kept on a bank's servers; it may be visible by logging in via an employee or client login to see the accounts, but is not actually kept on a laptop.
  • The dates on the bank transfers from the Bratva are for May 2016, yet the flashback is supposed to be in 2012.




  1. Marc Guggenheim (@mguggenheim) - Twitter
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