Plot Summary for "Back to Where You've Never Been" (2012)  

In an effort to find a way home, Peter journeys to the Other Side to confront Walternate. His venture proves more dangerous than expected. Meanwhile, Olivia receives a dire premonition from an Observer.

http://www.fileserve.com/file/TaPRRhe/Fringe.S04E08.XviD.HDTV.avi