100 years in the future, when the 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.
Writer: Jason Rothenberg
Air date: 2017-02-01
Runtime: 43 min
Overview: Clarke and her friends struggle with how to proceed after the fate of the world is revealed.
Writer: Justine Juel Gillmer
Air date: 2017-02-08
Runtime: 42 min
Overview: The burden of leading weighs heavily upon Clarke and Bellamy when different challenges force them to determine who will live and die.
Writer: Heidi Cole McAdams
Air date: 2017-02-15
Runtime: 41 min
Overview: Jaha leads Clarke and Bellamy down a road to possible salvation while tensions rise in Arkadia and Polis.
Writer: Kim Shumway
Air date: 2017-02-22
Runtime: 42 min
Overview: Continued struggles with leadership and trust in Arkadia and Polis take violent turns while Abby leads a team to a distant location hoping to find answers.
Writer: Morgan Gendel
Air date: 2017-03-01
Runtime: 40 min
Overview: Clarke makes a desperate plea with a former allied force in an attempt to avoid a war and ensure the survival of her people.
Writer: Charmaine DeGraté
Air date: 2017-03-15
Runtime: 42 min
Overview: Clarke and Roan are forced to work together when they are tasked to deliver a dangerous but crucial asset to Abby through enemy territories.
Writer: Terri Hughes
Air date: 2017-03-22
Runtime: 42 min
Overview: Clarke's arrival on the island quickly takes a turn for the worse. Meanwhile, Bellamy tries to avoid further tragedy in Arkadia.
Writer: Lauren Muir
Air date: 2017-03-29
Runtime: 42 min
Overview: After a disappointing discovery, Clarke and Abby question how far they're willing to go. Meanwhile, Jaha finds a lead to the mysterious Second Dawn.
Writer: Miranda Kwok
Air date: 2017-04-26
Runtime: 42 min
Overview: Jasper and Bellamy go on a quest. Meanwhile, Clarke struggles to keep the peace after word of Jaha's discovery spreads.
Writer: Wade McIntyre
Air date: 2017-05-03
Runtime: 42 min
Overview: Octavia fights in the final battle for her people's survival, but not everyone is willing to play fair.
Writer: Shawna Benson
Air date: 2017-05-10
Runtime: 42 min
Overview: Clarke faces the consequences of her fateful choice.
Writer: Wade McIntyre
Air date: 2017-05-17
Runtime: 42 min
Overview: Jaha and Kane disagree over how to handle their grim reality. Meanwhile, Clarke leads a group to save a friend.
Writer: Jason Rothenberg
Air date: 2017-05-24
Runtime: 41 min
Overview: It's a race against the end of the world as Praimfaya arrives forcing our heroes to make impossible decisions to ensure their survival.
