9. Unity Day

Complete story — includes the ending

"Unity Day" arrives, when the joining of the orbiting space stations is celebrated. As the 100 celebrate, they find their video link interrupted when a bomb explodes during the ceremony on the Ark. Diana engineers a mutiny in order to hijack the first dropship. As the ship launches, it is not fully disconnected from the Ark's main systems, causing an Ark-wide power outage and disabling every dropship. On the ground, in an effort to initiate peace, Finn arranges a meeting with the local grounder leader through Lincoln. Clarke represents the group and goes to the meeting, where she meets Anya, a grounder leader. Anya reveals that the 100's "flares" burned down a grounder village, causing the grounders to desire their destruction despite it having been an accident. Jasper, who along with Bellamy is monitoring the meeting from cover, believes he sees the grounder spotters in the trees about to shoot, he opens fire, and the meeting dissolves into battle. That night, Clarke and Bellamy see the dropship descending. It comes in too fast with no parachute and violently crashes in the distance.