16. Blood Must Have Blood, Part Two

Complete story — includes the ending

Clarke joins Octavia in the tunnels and is let into Mount Weather by Bellamy. With the 47 waiting for bone marrow extraction, Clarke and Bellamy take Dante hostage. When Cage still refuses to stop, Clarke shoots his father, which leads Cage to begin bone marrow extraction on Abby. Seeing no other option, Clarke has Monty hack into Mount Weather's air filtration system and she and Bellamy irradiate the mountain, killing the entire population, including Maya. Cage escapes but comes upon Lincoln, who injects Cage with the reaper drug, killing him, leaving Emerson, who also escaped, as the last Mountain Man. Everyone returns to Camp Jaha but Clarke, wracked with guilt over the deaths of hundreds of people, leaves. Jaha and Murphy arrive at an island where they separate. Murphy finds a lighthouse inside of which he watches a video recording (dated May 10, 2052) of the previous occupant who says she "got the launch codes", before shooting himself. In the final scene, Jaha finds a well kept mansion, surrounded by flying drones, where he meets an A.I., named "A.L.I.E.", in the hologram form of an attractive dark-haired woman wearing a red dress, who thanks him for his "gift", the nuclear warhead from the missile he used to land on Earth.