12. We Are Grounders - Part I

Clarke is recaptured by Anya, and they encounter a grounder named Tristan, who assumes command. Clarke is saved by Lincoln and taken to a very much alive Finn. Lincoln leads the two through a network of tunnels occupied by the reapers, cannibalistic humanoids the grounders themselves are afraid of. Lincoln seemingly sacrifices himself so Clarke and Finn can live to warn the others, including Octavia. Back at the dropship, Murphy has taken Jasper hostage. Bellamy trades himself for Jasper. While Raven attempts to open the dropship door, Murphy shoots his gun aimlessly at the floor after hearing a gasp, accidentally shooting her.

Murphy prepares to hang Bellamy. She finally succeeds in opening the door only to find Bellamy dangling, but is able to rescue him. Murphy retreats to the upper level, Murphy blows a hole in the ship with gunpowder and escapes with a radio. A returned Clarke convinces the group to flee the camp for the ocean where they'll be safe. On the Ark, with the dropships no longer functional, Jaha realizes that the only way to save the rest of the citizens is by bringing the Ark and its people to the ground.