Kara Blake is the twin sister of Octavia Blake and the younger sister of Bellamy Blake. After being locked under the floorboards for 16 years, her and Octavia get caught and are arrested and their mother is floated because on the Ark you're only aloud one child. Now 1 year later, Kara and 99 other juvenile delinquents are sent down to earth to see if it's survivable because the Ark is dying.