Murphy plots to betray the former Chancellor.
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3. Ye Who Enter Here - Murphy plots to betray the former Chancellor.
Clarke is in danger as she sets out on her own.
Bellamy and Kane risk their lives to rescue Clarke.
Clarke discovers the mastermind behind a devious plan.
Clarke's hope for peace is dashed by a new threat.
A silent and mysterious threat is brewing.
A flashback takes us to a darker time for humanity.
Kane may be forced to use drastic measures.
Octavia is forced to make a devastating decision.
Jaha takes drastic measures to convince Abby to join him.
Alie forces Raven's dark side to come out.
Jaha returns to Polis, while Octavia uncovers a clue.
Kane reaches his breaking point.
Clarke, Bellamy, Octavia and Jasper hit a tragic roadblock.
Clarke finds hope in a place that she would never have expected.
Everyone faces the tragic reality of their terrible situation.