Clarke confronts a new adversary. A surprising connection takes us back to the past and the nuclear apocalypse that destroyed the Earth.

Cast: Eliza Taylor, Bob Morley, Marie Avgeropoulos, Lindsey Morgan, Richard Harmon, Tasya Teles, Shannon Kook, JR Bourne, Shelby Flannery, Chuku Modu, Crystal Balint, Chris Bradford, Jason Diaz, Leah Hennessey, Britt Irvin