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Season 1 - Sep. 09, 2008
Season 2 - Sep. 17, 2009
Season 3 - Sep. 23, 2010
Season 4 - Sep. 23, 2011
Season 5 - Sep. 28, 2012

Fringe Season 4 Episode 4
HD
Overview:
Olivia uncovers a dangerous force that may be connected to past experiments with Cortexiphan. The investigation forces Walter to leave the lab for the first time in years and travel to Massive Dynamic to examine old case files. Walter struggles with his emotional state as he confronts the demons of his past.