"Lost in the Flood" is the twenty-second episode of the fourth season of Arrow, and the ninety-first episode overall. It aired on May 18, 2016.


Following the shocking events in the previous episode, Oliver and Diggle race to rescue Thea, while Felicity, Curtis and Noah join together to stop Darhk.[1]


Preparation ran from March 18 until March 29, 2016, with a break on March 25, 2016 for Good Friday. Shooting ran from March 30 until April 8, 2016.[2]


  • Damien Darhk refers to the world going "Dr. Strangelove", referencing the 1964 film which ends with the world entering a nuclear apocalypse.
  • Diggle refers to mount weather also mentioned in the show the 100



Sneak peeks


  • This episode follows the pattern of the penultimate episode of a season being named after a Bruce Springsteen song, in this case after the 1973 song "Lost in the Flood".


  1. Team "Arrow" Gains an Unlikely Ally in "Lost in the Flood" Synopsis - Comic Book Resources
  2. Marc Guggenheim (@mguggenheim) - Twitter