Amunet threatens to kill Caitlin if she doesn’t help perform a tricky medical task; The Thinker traps The Flash in a speedster-proof prison; Iris is forced to choose whether to save Caitlin or Barry.
Crisis on Earth X, Part 3
Barry and Iris’s wedding brings the gang together, but things go awry when villains from Earth-X attack the ceremony.
Therefore I Am
Barry comes face to face with DeVoe; DeVoe’s past is revealed; Iris puts the final touches on the wedding, only one week away.
When Harry Met Harry…
When Native American artifact collectors are attacked by a meta who can bring inanimate objects to life, Barry turns to a surprising ally for help; Harry enlists Cisco’s help to determine the identity of The Thinker.
Girls Night Out
Caitlin receives an ominous threat from her old boss; Felicity arrives to help the girls celebrate Iris’s bachelorette party; Cisco, Joe, and the guys take Barry out for a night on the town.
Elongated Journey Into Night
Cisco is shocked when Gypsy’s father shows up and takes an immediate disliking to Cisco; Barry runs into Ralph Dibny, his former nemesis.
Luck Be a Lady
Barry and the team experience a string of bad luck and discover it is caused by a new metahuman; Harry Wells returns to Earth-1 to give Wally a message from Jesse.
Barry has his hands full when he takes on a dangerous meta who can control technology, while also confronting an obstacle in his personal life: the ramifications of abandoning Iris for six months to balance the Speed Force. Meanwhile, Gypsy breaches in for a hot date with Cisco, but she gets annoyed when his work keeps them apart.
With nothing left to lose, Barry takes on Savitar in an epic conclusion.
Barry chooses to use any means necessary to save the woman he loves; The Flash turns to Captain Cold for help.