"The lesson I have prepped for today is much more simple. Life 101: there are no happy endings."
Clifford DeVoe to Barry Allen
"Don't Run" is the ninth and midseason finale episode of the fourth season of The Flash, and the seventy-eighth episode overall. It aired on December 5, 2017.


Amunet kidnaps Caitlin and puts meta-dampener handcuffs on her to keep her from turning into Killer Frost. Amunet tells Caitlin she needs her to perform a tricky medical task and if Caitlin fails, Amunet will kill her. Meanwhile, The Thinker traps The Flash in a speedster-proof prison. With the clock ticking, The Team doesn't have the time or resources to track both Caitlin and Barry so Iris is forced to choose who to save.[src]



Special Guest Star

Guest Star





  • The title is a reference to Barry's final line as the CCPD show up to arrest him.
  • Cisco likens Harry to Ebenezer Scrooge and the Grinch. In reply, Harry claims that "you're a mean one, I wouldn't touch you with a 39-and-a-half-foot pole", quoting the song "You're a Mean One, Mr. Grinch" from the 1966 TV special Dr. Seuss' How the Grinch Stole Christmas!.
  • When Amunet prevents Caitlin from transforming into Killer Frost, she quips that "Frosty melted away", referencing the 1969 TV special Frosty the Snowman in which the protagonist is in danger of melting.
  • Cisco calls Amunet an "evil Mary Poppins", referencing her English accent.
  • The Flash suit is revealed to have kept the life-raft function that Cisco installed earlier and showed off in "Mixed Signals".
  • When DeVoe (disguised as Dominic Lanse) goes to describe the West house, Cisco suggests "bitchin'", a callback to the season premiere, "The Flash Reborn", in which a decoded message from a discombobulated Barry reads "This house is bitchin'".
  • DeVoe gains the ability of telepathy through his transferring his mind and consciousness into the body of Dominic. In the DC comics, Clifford DeVoe originally the ability of telepathy, although Barry Allen is immune to telepathy.
  • The Thinker tells the Flash, "You should learn to lose every once in a while, Bar. A little humility will prepare you for what lies ahead." These are actually the Thinker's last dying words to Jay Garrick, the original Flash in the comics.
  • It is revealed that DeVoe's birthday is on Christmas.


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