While her friends in space discover a long-needed ray of hope, Clarke fights to live on an empty, destroyed planet.
When it looks like the bunker and everyone inside it are in danger, Octavia is forced to accept advice from an unexpected source.
Bellamy takes the lead in looking for a possible route to return home.
seeking to save some of their own, the group must enlist the aid of the dangerous new residents of Shallow Valley.
Octavia neglects Bellamy and Clarke's advice and leads her people toward Shadow Valley.
Kane puts Wonkru's loyalty to Octavia to the test in an effort to show that he is handy.
Something shocking about Wonkru's battle tactics is revealed to Clarke and Bellamy.
Bellamy is forced into a difficult situation by Clarke's persistent desire to keep Madi safe.
In Shadow Valley, Murphy's actions unleash disastrous consequences.
Monty seeks to make Wonkru understand that there are choices other than violence, as well as the valley. Meanwhile, McCreary's patience is exhausted, and Abby's condition is getting worse.
Clarke discovers more of Wonkru's struggles in the bunker as she rushes to save Abby.
Octavia causes her people to go to war. Our heroes must put aside their disagreements while they are behind enemy lines in order to prevent the annihilation of Wonkru.
In order to make one last stand to survive, Clarke and her friends have to put everything on the line.