With oxygen levels hitting dangerous lows, the council is forced to make a difficult decision on The 100 Season 1 Episode 5.
Abby's locked up for sending Raven down to Earth, but her medical skills are too important to waste given the crisis on the Ark. She makes an important decision which brings about a fundamental change in their society.
On Earth, Raven arrives and she's reunited with Finn. When truths are revealed the 100 band together to make a difference.
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