The official synopsis is here for the first episode, entitled “Echoes” of the fourth season of The 100. It is pretty vague and minimal, but let me assure you, it is enough to get my blood pumping. Check it out.
The 100 “Echoes”
SEASON PREMIERE- Clarke (Eliza Taylor) and her friends struggle with how to proceed after the fate of the world is revealed. Paige Turco, Bob Morley, Marie Avgeropoulos, Devon Bostick, Lindsey Morgan, Christopher Larkin, Richard Harmon, Zach McGowan, Isaiah Washington, and Henry Ian Cusick also star. Dean White directed the episode written by Jason Rothenberg. (#401) Original airdate 02/01/2017.