Complete story — includes the ending
At Arkadia, Harper and Monty sleep together while Raven hacks into the City of Light. She breaks through the firewalls but is blocked by the spirit of Hannah. Monty erases his mother's code, but A.L.I.E. removes herself from Arkadia before Raven can destroy her code; however, the attempt reveals that A.L.I.E. has a hidden kill switch that can end her. Murphy, Indra, and Pike escape the Polis dungeons and destroy A.L.I.E.'s core processor, but she has already migrated to the computer system on the Ark, still orbiting Earth. At the oil rig, Clarke plans to implant the Flame into Luna against her will, but is unsuccessful. Some of Luna's people return from the mainland having been taken over by A.L.I.E., and capture Jasper and Luna. After breaking free and killing her captors, Luna, knowing Clarke will stop at nothing to get her to accept the Flame, drugs Clarke and her companions, and has them returned to the mainland.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, List of The 100 episodes. HTML formatting and reference markers removed. · Content license