100 years in the future Earth has been abandoned due to radioactivity. The last surviving humans live on an ark orbiting the planet - but the ark won't last forever. So the repressive regime picks 100 expendable juvenile delinquents to send down to Earth to see if the planet is still habitable.
After all the fighting and loss, Clarke and her friends have reached the final battle. But is humanity worthy of something greater?
Clarke and Octavia mount a desperate rescue mission as the Disciples close in on what they want.
Clarke and her friends reckon with all that has happened only to find an unexpected threat looming.
The red sun derails Clarke's plans.
It's a new day in Sanctum. Clarke, Octavia, Raven and Echo struggle with a new foe.