The Elongated Knight Rises

"I Elongate, man!" - Ralph Dibny

"The Elongated Knight Rises" is the eleventh episode of the fourth season of The Flash, and the eightieth episode overall.

Synopsis
When a familiar villain returns to terrorize Central City, Ralph must rise up to defend the innocent while Barry is detained by his trial. Meanwhile, Barry searches for the strength to keep his optimism alive in the face of his new circumstances.

Trivia

 * The title references the final entry in The Dark Knight trilogy, The Dark Knight Rises, which also sees a superhero battle his fear and grow stronger.
 * While trying to come up with a superhero name while talking to the suicide bomber, Ralph references to two Marvel Comics Superheroes.
 * He says "It's your friendly neighborhood superhero," referencing Spider-Man.
 * He continues that phrase with "Mister..." but stops there, referencing Mister Fantastic, a Marvel superhero with similar powers.
 * The Mystery Girl, who first appeared at Barry and Iris's wedding, returned at the end of the episode, interacting with Ralph and Cisco. Later on, she is seen writing in a diary using the same "language" Barry used while writing on the walls in.
 * This is one of the only non-Supergirl episodes to have a reference to Supergirl without being a crossover. The other one is Dead or Alive.