ROADBLOCK — Clarke (Eliza Taylor), Bellamy (Bob Morley), Octavia (Marie Avgeropoulos) and Jasper (Devon Bostick) hit a tragic roadblock. Meanwhile, Raven (Lindsey Morgan) and Monty (Christopher Larkin) make an important discovery. Isaiah Washington and Richard Harmon also star. P.J. Pesce directed the episode written by Lauren Muir & Kira Snyder (#314). Original airdate 5/5/2016.