Season 4, Episode 8 Back to Where You've Never Been
First Aired: January 13, 2012
Peter takes a dangerous journey to the alternate universe to confront Walternate, while Olivia hears an ominous prediction from an Observer.
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- Premiered: September 9, 2008
- Rating: TV-14
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- Premise: The passengers aboard Flight627 have died under mysterious circumstances. As FBI begins investigations, they soon realise that this was only the beginning of a greater calamity. (more)