Clarke and her friends struggle with how to proceed after learning the fate of the world.
The burden of leadership weighs on Clarke and Bellamy when different challenges force them to determine who will live and die.
Jaha leads Clarke and Bellamy down a road to possible salvation while tensions are on the rise in Arkadia and Polis.
Struggles for leadership and trust in Arkadia and Polis become violent; Abby guides a team on a quest for answers.
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 so they can deliver a valuable asset to Abby and her team.
Clarke's arrival on the island takes a turn for the worse; Bellamy tries to avoid further tragedy in Arkadia.
Clarke and Abby consider how far they are willing to go; Jaha discovers a lead to the mysterious Second Dawn.
Jasper and Bellamy embark on a quest; Clarke struggles to keep the peace after word of Jaha's discovery spreads.
Octavia fights in the final battle for the survival of her people, but not everyone is willing to play fair.
Clarke faces the consequences of her fateful choice.
Jaha and Kane disagree over how to handle their grim reality; Clarke leads a group to save a friend.