[s1e12] We Are Grounders - Part 1 Apr 2026

(Season 1, Episode 12) is the first part of The 100 's high-stakes season finale, originally airing on June 4, 2014. The episode features a three-pronged narrative as the delinquents face total war, internal betrayal, and a desperate survival mission from space . Plot Summary

: After returning to camp, Clarke and Bellamy disagree on strategy. Bellamy gives a rousing speech declaring that they are now "Grounders" and should stand their ground to fight. Clarke overrules him, insisting they must evacuate to the ocean to survive the incoming army.

: With only 51 hours of life support remaining, Jaha and Kane realize survival on the Ark is impossible. Inspired by old footage of a young Clarke and Wells, Jaha develops a radical plan to pilot the entire Ark station into Earth’s atmosphere. Key Developments & Climax