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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.

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

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

Clarke's past catches up to her.

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

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

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

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

A special Naming Day changes everything in Sanctum. Gabriel (guest star Chuku Modu) comes face to face with an old friend.

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