The journey to the City of Light continues, and Jaha makes a move that shocks Murphy. Clarke receives help from an unexpected source, a visitor surprises Octavia, and Lincoln gets his revenge. Meanwhile, at Mount Weather, Cage moves forward with his mission and Bellamy and the group struggle to break free.
Jaha employs a terrifying new method to convince Abby to join his cause, Kane is on a mission. Bellamy is hit with a hard truth. Monty finds himself in a precarious situation. Jasper rushes to save one of his own.