Complete story — includes the ending
Lexa reveals to Clarke that she intends to initiate the Sky People into her Coalition. Bellamy, his girlfriend Gina, Octavia, and Raven arrive at Mount Weather with supplies for the Farm Station refugees. There, Echo, the grounder Bellamy first freed from the cages beneath the mountain, appears and speaks of an Ice Nation plot to attack the summit in Polis. Bellamy, Pike, and Octavia leave for Polis. As they reach the summit, it is revealed there is no imminent threat to those present; the "warning" was a ruse to lure them away. An assassin infiltrates Mount Weather, kills Gina, and punches in the self-destruct code. Raven and Sinclair manage to kill the assassin and get the disarm code, but Mount Weather detonates, killing all 36 members of the Farm Station; only Raven and Sinclair survive. It is revealed that Echo is working with Queen Nia of the Ice Nation, who is helped by Emerson, the last survivor of Mount Weather, in carrying out its destruction.
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