We Are The Flash

"We Are The Flash" is the twenty-third and final episode of the fourth season of The Flash, and the ninety-second overall. It aired on May 22, 2018.

Synopsis
Team Flash gets help from a surprising ally in their battle against DeVoe.

Trivia

 * The title references the quote Iris said to Barry in . In that episode, she convinced him about being together instead of doing the battles alone.
 * It is revealed in this episode that Mystery Girl is actually Nora Allen, Barry and Iris' daughter from the future.
 * "This House is Bitchin'" was referring to Nora Allen, Barry and Iris's daughter from the future walking into the West House.
 * This is the first time since that DeVoe appears as The Thinker in his original look.
 * This is the first appearance of Wally West on The Flash since "Therefore I Am", and his first appearance outside of DC's Legends of Tomorrow since "Crisis on Earth-X, Part 1".
 * Barry battling dozens of mental copies of Devoe while guiding Ralph outside of the villains mind resemble the final fight between Barry and a self-replicating Danton Black during episode "Fastest Man Alive".
 * Ralph refers to the numerous Clifford DeVoe's attacking him and Barry when they're inside The Thinker's mind as "attack of the clones" from the Star Wars franchise.
 * This is the first non-Supergirl episode in the Arrowverse that Kara Danvers is mentioned outside of crossovers.
 * Along with the reveal of Nora Allen II, a second cliffhanger was originally filmed for this episode, which would have teased who the villain for the next season would be. But it was cut from the episode due to time constraints.