A small group goes down to explore the mysterious new planet, while members of Wonkru on the Mothership 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 to let her people stay. Meanwhile, Bellamy, Echo & Octavia discover a new threat while on a mission to retrieve the transport ship.

Clarke embraces the traditions of Sanctum and tries to make amends for her past actions.

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

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

Clarke fights for her life when her 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.

While Octavia is forced to confront her past, Bellamy ventures into enemy territory with an unlikely companion.

While Gabriel must make a difficult choice, Russell seeks justice. Bellamy reunites with his sister Octavia.

Bellamy and Octavia must work together to save their friends, while Echo is forced to face her past.

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

Sanctum becomes a battleground between the devout and the non-believers, while the mystery of the Anomaly deepens.