Fringe
FBI Special Agent Olivia Dunham, brilliant but formerly institutionalized scientist Walter Bishop and his scheming, reluctant son Peter uncover a deadly mystery involving a series of unbelievable events and realize they may be a part of a larger, more disturbing pattern that blurs the line between science fiction and technology.

Season 4 · Episode 19 ·
Letters of Transit
The Fringe team goes back to the future as the story jumps ahead to 2036, when the Observers and the Fringe team engage in a game-changing battle.
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Episode 19 of season 4 of Fringe: “Letters of Transit”. Aired 2012-04-20. Watch it online free on ZapFlix.