Season Four

The Four Horseman

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Arkadia takes in Grounders already affected by radiation sickness, forcing Clarke and the others to consider a new plan from Jaha -- or watch hundreds die. Roan turns to Octavia and Indra for help when the Flame is stolen, and Murphy returns to Arkadia.
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Jaha (Isaiah Washington) leads Clarke (Eliza Taylor) and Bellamy (Bob Morley) down a road to possible salvation while tensions rise in Arkadia and Polis.

Paige Turco, Marie Avgeropoulos, Devon Bostick, Lindsey Morgan, Christopher Larkin, Richard Harmon, Zach McGowan, Isaiah Washington and Henry Ian Cusick also star. P.J. Pesce directed the episode written by Heidi Cole McAdams (#403).