16 episodesFirst aired 20 May 2020
After arriving on a new planet, our heroes found a place where they hoped to try again. Clarke and Bellamy led a group down to this mysterious world to start anew, but not everything on Sanctum was as perfect as it seemed. Despite their determination to do better, threats both seen and unseen once again forced them to fight for their lives and the future of humanity.
E1May 202041m
Clarke and her friends attempt to rebuild Sanctum as a new threat rises in the woods.
E2May 202042m
Echo and Gabriel learn more about Hope and her mysterious past.
E3Jun 202042m
Raven faces an unexpected threat. Clarke must keep the peace among opposing factions in Sanctum.
E4Jun 202042m
Mysterious outsiders arrive with news of Clarke's missing people.
E5Jun 202042m
Octavia gets to know a whole new world. Meanwhile, Murphy and Emori play make believe.
E6Jun 202042m
Clarke and her friends find themselves on a planet that is not what it seems.
E7Jul 202041m
Emori tries to heal Sanctum's old familial wounds while Echo, Octavia and Diyoza struggle with new ones.
E8Jul 202041m
Clarke confronts a new adversary. A surprising connection takes us back to the past and to the nuclear apocalypse that destroyed the Earth.
E9Jul 202041m
Murphy and Indra must defuse a tense situation. Old friends make new allegiances.
E10Aug 202042m
Sheidheda makes his move. A Disciple goes rogue.
E11Aug 202042m
Where in the universe is Bellamy Blake?
E12Aug 202042m
It's a new day in Sanctum. Clarke, Octavia, Raven and Echo struggle with a new foe.
E13Sept 202041m
The red sun derails Clarke's plans.
E14Sept 202042m
Clarke and her friends reckon with all that has happened only to find an unexpected threat looming.
E15Sept 202042m
Clarke and Octavia mount a desperate rescue mission as the Disciples close in on what they want.
E16Sept 202043m
After all the fighting and loss, Clarke and her friends have reached the final battle. But is humanity worthy of something greater?