Still reeling after receiving Monty's message, a small group goes down to explore the mysterious new planet. Back on the Mothership, several members of Wonkru face the consequences of their decisions.
The team on the ground fights to survive the threat they face on the new planet. Meanwhile, Raven must join forces with an unlikely ally to save everyone on board the Mothership.
Clarke tries to win over the leaders of Sanctum in order to let her people stay. Meanwhile, Bellamy, Octavia, and Echo discover a new threat while on a mission to retrieve the transport ship.
As Clarke and the others try to integrate themselves into the Sanctum, Octavia and Diyoza fight for their lives against an opposing faction of survivors.