Overview:Walter explains to Olivia how Peter came from the alternate universe, and how he was willing to risk everything to save his son.
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First Air Date: Sep 09, 2008Last Air date: Jan 18, 2013Season: 5 SeasonEpisode: 100 EpisodeRuntime: 46:14 minutesQuality: HDIMDb: 2.869 / 10 by 2377 usersPopularity: 388.285Language: en
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