"Run, Iris, Run" is the sixteenth episode of the fourth season of The Flash, and the eighty-fifth overall. It aired on March 13, 2018.


Team Flash confronts a new bus meta, Matthew AKA Melting Point, with the ability to swap people's DNA. During a battle with Team Flash, Matthew transfers Barry's super speed to Iris. Now, with a new threat unleashed on Central City, Barry must act as the team leader while Iris takes on the mantle of superhero speedster in order to defeat their new foe.[1]


Promotional images



  • The episode's title plays off the recurring phrase, "Run Barry, run", which has been used to encourage Barry Allen to run faster throughout the series. The alternative phrase featuring Iris' name is used by Barry when Iris has to create a tidal wave to put out Jaco Birch's thermal cyclone.
  • Cisco is appalled when Harry suggests "Frankensteining" all of the remaining bus metas' DNAs together, referencing the Mary Shelley novel Frankenstein in which a scientist puts together body parts to create a makeshift creature.
  • After Ralph is anxious that he'll get "terminated" by DeVoe, he claims that he's Sarah Connor, a protagonist of the Terminator franchise.
  • Cisco mentions that DeVoe's machinations are warping his brain, likening the situation to the 2004 film Spider-Man 2.
  • Discussing Harry wearing the Thinking Cap, Cisco vows to pull him out before he "[starts] acting like Locutus of Borg and [starts] assimilating everybody", referencing a character from the Star Trek franchise.


  1. Flash First Look: Iris Suits Up In “Run, Iris, Run” - FlashTVNews