Complete story — includes the ending
The 100 discover no survivors at the Exodus dropship. Murphy returns to the dropship after being captured and tortured by the grounders for information about the group. Shortly afterwards, a viral hemorrhagic fever spreads through the camp and Clarke realizes the grounders used Murphy as a form of biological warfare. Bellamy, Raven and Clarke all contract the disease though Octavia and Finn are immune. Octavia learns from Lincoln that this is his people's way of softening the battlefield and that the virus will soon pass; Lincoln intends to flee the area and warns of Mountain Men who will be after them. Raven builds a bomb to delay the coming attack, but collapses from the virus before it can be detonated; Finn rescues Raven while Jasper detonates the bomb just in time with Monty's help. Later, Murphy smothers Connor as revenge for his part in Murphy's hanging. Raven breaks up with Finn after realizing that he's in love with Clarke. At least three of the 100 die of the virus, but the rest begin to recover.
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