MacLaren urges Yates to help him when a Traveler with a mission vital to humanity’s survival arrives in the body of a just-captured serial killer.

Delilah and Sophie come together during a family emergency; Rome and Regina learn that their potential birth mother could be in danger; and Maggie and Gary face a harsh reality…

With DeVoe’s Enlightenment device nearly complete, in order to disable it The Flash and his team must put their faith in an unlikely ally – Amunet Black. Meanwhile, Harry hits…

Having received an ominous threat from her old boss, Amunet, Caitlin fears that her past time as Killer Frost may be back to haunt her. Felicity comes to Central City…