Clarke is on a mission that could change everything. Meanwhile, Murphy gains insight that might prove useful in ensuring his survival. Lastly, Kane reaches a breaking point.
Clarke, Bellamy, Octavia and Jasper hit a tragic roadblock. Meanwhile, Raven and Monty make an important discovery.
Clarke finds hope in the most unlikely place. Meanwhile, Alie's master plan comes together.
In the season's epic and mind-bending conclusion, our heroes begin to face the reality of their tragic situation. Everyone prepares for a final showdown.
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