Martha Plimpton guest stars on this episode of Fringe. It airs on May 6, 2010 and focuses on the past of Peter. Watch a promo now for "Northwest Passage."

Fringe Season 2 Episode 20 Quotes

I don't know who I am anymore.


Peter: I'm sorry. I needed to know your blood was still red.
Mathis: What other color would it be?