Captain Cold recruits a partner to take on Flash and dispose of the hero once and for all. However, when Barry chooses to focus on his rematch with Reverse-Flash, the villains take Caitlin hostage to force the speedster's hand. Meanwhile, Iris prepares to move out, and Cisco tries to redeem S.T.A.R. Lab's reputation.moreless
During a sheriff's retreat, Jody stumbles across murders involving eaten corpses and calls in Sam and Dean. When they arrive, they ask Jody to keep overeager Sheriff Donna Hanscum distracted while they look into the killings.moreless
A metahuman killer goes after his enemies using his ability transform into poison gas. Meanwhile, Caitlin revisits the site where her fiancé Ronnie died, and Joe visits Henry in prison.
The teams on the two worlds work together to solve the case of a shapeshifter, and Agent Lincoln Lee joins his world's team when no one remembers the existence of Peter Bishop.