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24. "An Enemy of Fate," Fringe
The oft-bittersweet sci-fi drama proves with its series finale that all happy endings come with a price. In order to reboot time and rid the earth of its Observer invaders, our beloved Walter takes the anomaly Michael to the future to live out their days, essentially sacrificing himself. (He suddenly disappears in 2015 without explanation.) With Walter gone from their timeline, Peter, Olivia and Etta are able to live out their days in peace.