The 100 4×03 “The Four Horsemen” Season 4 Episode 3 Inside – TENSIONS RISE – Jaha (Isaiah Washington) leads Clarke (Eliza Taylor) and Bellamy (Bob Morley) down a road to possible salvation while tensions rise in Arlcadia and Polis. Paige Turco, Marie Avgcropoulos, 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). Original air date 2/15/2017.