The red sun derails Clarke's plans.

Where in the universe is Bellamy Blake?

Lexa tries to maintain peace and order within the clans, and Clarke uncovers a strange and game-changing truth. Meanwhile, a flashback takes us into the darker chapter of humanity’s past.

Kane is searching for a peaceful way to handle things but soon realizes he may be forced to resort to drastic measures. Meanwhile, Pike suspects that there may be a leak within the walls of Arkadia. Lastly, Raven has a plan and reaches out to Jasper for help.

Mysterious outsiders arrive with news of Clarke's missing people.

Clarke discovers a shocking truth, and Octavia is forced to make a decision that could have devastating consequences. Meanwhile, Kane and Abby share a moment.

Clarke and her friends find themselves on a planet that is not what it seems.

Jaha employs a terrifying new method to convince Abby to join his cause, Kane is on a mission, and Bellamy is hit with a hard truth. Meanwhile, Monty finds himself in a precarious situation, and Jasper rushes to save one of his own.

Jaha returns to Polis, and Murphy has a surprise encounter. Meanwhile, Octavia uncovers a clue.

Clarke and her friends attempt to rebuild Sanctum as a new threat rises in the woods.

97 years after a nuclear war, human kind is living in space. 100 juvenile delinquents are sent down to Earth to see if the planet is habitable.

Discovering that Jasper may still be alive, Clarke, Bellamy, Finn, Wells and Murphy head out to find him. On the Ark, Abby is determined to prove Earth is habitable, and enlists a mechanic to craft an escape pod.

Echo and Gabriel learn more about Hope and her mysterious past.

Raven faces an unexpected threat. Clarke must keep the peace among opposing factions in Sanctum.

It's a new day in Sanctum. Clarke, Octavia, Raven and Echo struggle with a new foe.

Clarke and her friends reckon with all that has happened only to find an unexpected threat looming.

After all the fighting and loss, Clarke and her friends have reached the final battle. But is humanity worthy of something greater?

Clarke is on a mission that could change everything. Meanwhile, Murphy gains insight that might prove useful in ensuring his survival. Lastly, Kane reaches a breaking point.

Clarke, Bellamy, Octavia and Jasper hit a tragic roadblock. Meanwhile, Raven and Monty make an important discovery.

Emori tries to heal Sanctum's old familial wounds while Echo, Octavia and Diyoza struggle with new ones.

Murphy and Indra must defuse a tense situation. Old friends make new allegiances.

Clarke and Octavia mount a desperate rescue mission as the Disciples close in on what they want.

Alie forces Raven’s dark side to come out, and Jasper’s anger continues to grow. Meanwhile, Octavia wrestles with her place in the world, and Monty is forced to make a split second decision.

Clarke and her friends struggle with how to proceed after the fate of the world is revealed.

The burden of leading weighs heavily upon Clarke and Bellamy when different challenges force them to determine who will live and die.