Watch The 100 Season 3 Episode 15 Online to see Clarke and the others team with an unlikely ALIE and return to Polis to take ALIE out once and for all.
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Watch The 100 Season 3 Episode 15 Online and see Clarke and the others team with Roan, returning to Polis with a plan to use Ontari in order to defeat ALIE. Meanwhile, Raven, Monty, Harper, and Jasper remain behind at Arkadia with a plan of their own, but little do they know one of their group is already chipped.
On the first part of The 100 Season 3 Finale, Clarke finds hope in the most unlikely place. Meanwhile, ALIE's master plan comes together.