In the aftermath of the chaos done by ALLIE, Clarke struggles with the decision over telling the world of the impending nuclear apocalypse. The Grounders struggle with each other and Echo uses the chaos as a chance to declare war on the Sky People. Written by cyberboy1127-249-955930

The burden of leading weighs heavily upon Bellamy (Bob Morley) and Clarke (Eliza Taylor) when different challenges force them to determine who will live and die.

Jaha leads Clarke and Bellamy on a road to possible salvation, while tensions rise in Arkadia and Polis.

Clarke's decision on who should live and die causes tension in Arkadia. Abby tries to figure out how to obtain Luna's immunity. Bellamy and his friends face judgement from the Ice Nation. Jasper finally loses himself when the Black Rain comes. Written by cyberboy1127-249-955930

Clarke pleads with a former allied force to avoid a war and ensure her people's survival.

Clarke and Roan are forced to work together when they are tasked to deliver a dangerous but crucial asset to Abby through enemy territories.

Abby desperately tries to make the cure, but it requires her to make an ultimate decision. Raven and Abby's health are slowly deteriorating. Arkadia is thrown into panic when the Black Rain finally comes. Octavia roams alone in her pain and grief. Written by cyberboy1127-249-955930

Clarke and Abby question how far they're willing to go when they make a disappointing discovery; Jaha finds a lead to the Second Dawn.

Clarke struggles to keep the peace after word of Jaha's discovery spreads.

Octavia fights in the final battle for survival, 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. Meanwhile, 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 decisions to ensure their survival.