Get a sneak peek at "Subject 13" now. We go back into the interesting past of Walter on this episode.
Fringe takes us back to Walter's past on "Subject 13." Check out the official promo now.

Fringe Season 3 Episode 15 Quotes

Walter: The texture of the universe has changed from my crossing. It cannot withstand any more damage.
Elizabeth: Neither can he, Walter. He is in constant distress.

Getting him back wasn't as easy as I thought.