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.

As tensions rise in Arkadia and Polis, Jaha leads Clarke and Bellamy down a road toward possible salvation.

While Abby leads a team to a distant location, hoping to find answers, the continued struggles with leadership and trust in Arkadia and Polis take a violent turn.

Clarke makes a desperate plea with a former allied force in an attempt to avoid a war and ensure the survival of her people.

Clarke and Roan must work together in hostile territory in order to deliver an invaluable asset to Abby and her team.

Clarke's arrival on the island quickly takes a turn for the worse. Meanwhile, Bellamy tries to avoid further tragedy in Arkadia.

After a disappointing discovery, Clarke and Abby question how far they're willing to go. Meanwhile, Jaha finds a lead to the mysterious Second Dawn.

Jasper and Bellamy go on a quest. Meanwhile, Clarke struggles to keep the peace after word of Jaha's discovery spreads.

Octavia fights in the final battle for her people's survival, but not everyone is willing to play fair.

Clarke faces the consequences of her fateful choice.

While Jaha and Kane disagree over how to handle their grim reality, Clarke leads a group to save a friend.

It's a race against the end of the world as Praimfaya arrives, forcing our heroes to make impossible choices to ensure their survival.