Clarke and her friends attempt to rebuild Sanctum as a new threat rises in the woods.
Echo and Gabriel learn more about Hope and her mysterious past.
As Raven faces an unexpected threat, Clarke must keep the peace among opposing factions in Sanctum.
Mysterious outsiders arrive with news of Clarke's missing people.
Octavia gets to know a whole new world.
Clarke and her friends find themselves on a planet that is not what it seems.
Emori tries to heal Sanctum's old familial wounds, while Echo, Octavia and Diyoza struggle with new ones.
Clarke confronts a new adversary; a look back to the past and the nuclear apocalypse that destroyed the Earth.
Murphy and Indra must defuse a tense situation; old friends make new allegiances.
Sheidheda makes his move; a disciple goes rogue.
Bellamy is missing somewhere in the universe.
Clarke, Octavia, Raven and Echo struggle with a new foe.
The red sun derails Clarke's plans.
Clarke and her friends reckon with all that has happened only to find an unexpected threat looming.