Episode 1 | Sanctum

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.

Episode 2 | Red Sun Rising

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.

Episode 3 | The Children of Gabriel

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.

Episode 4 | The Face Behind the Glass

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.

Episode 5 | The Gospel of Josephine

Jordan investigates Sanctum. Meanwhile, Octavia and Diyoza discover the threats of the new planet firsthand. Lastly, Bellamy and Clarke butt heads.

Episode 6 | Memento Mori

Diyoza learns more about the mysterious Children of Gabriel while Abby continues to search for a way to save Kane.

Episode 7 | Nevermind

Clarke's past catches up to her.

Episode 8 | The Old Man and the Anomaly

Octavia and Diyoza make their way to the mysterious anomaly in search of the Old Man. Meanwhile, Murphy has an offer for Emori.

Episode 9 | What You Take with You

Bellamy must venture into enemy territory with an unlikely companion. Meanwhile, Octavia is forced to confront her past.

Episode 10 | Matryoshka

Russell seeks justice. Meanwhile, Gabriel must make a difficult choice. Lastly, the Blake siblings reunite.

Episode 11 | Ashes to Ashes

Bellamy and Octavia must put aside any differences and work together to save their friends. Meanwhile, Echo confronts her past.

Episode 12 | Adjustment Protocol

A special Naming Day changes everything in Sanctum. Gabriel comes face to face with an old friend.

Episode 13 | The Blood of Sanctum

Sanctum becomes a battleground between the devout and the non-believers. The mystery of the anomaly deepens.