Still reeling after receiving Monty's message, a small group goes down to explore the mysterious new planet; 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; 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; Bellamy, Echo and 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.
Jordan investigates Sanctum; Octavia and Diyoza discover the threats of the new planet; Bellamy and Clarke butt heads.
Diyoza learns more about the mysterious Children of Gabriel; Abby continues searching 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; Murphy has an offer for Emori.
Bellamy must venture into enemy territory with an unlikely companion; Octavia is forced to confront her past.
Russell seeks justice; Gabriel must make a difficult choice; the Blake siblings reunite.
Bellamy and Octavia must work together to save their friends; Echo is forced to face her past.
A special "Naming Day" changes everything in Sanctum; Gabriel meets an old friend.
Sanctum becomes a battleground between the devout and the non-believers; the mystery of the anomaly deepens.