Fringe - Season 2 - Eps 21: Northwest Passage
In Noyo County, Washington, Peter stumbles across a grisly murder with ties to Newton and First Wave. He is forced to team up with a suspicious sheriff to get to the heart of the case. Meanwhile, Walter has trouble functioning without Peter, and worries he will be sent back to the mental institute.
About Fringe

Title: Fringe
First Air Date: 2008-09-09
Last Air Date: 2013-01-18
Status: Ended
Rating: 8.1/10 (from 2545 votes)
Language: EN
Seasons: 6
Total Episodes: 100
Network: FOX
Genres: Sci-Fi & Fantasy, Drama, Mystery
Production Companies: Warner Bros. Television, Bad Robot
Synopsis
FBI Special Agent Olivia Dunham, brilliant but formerly institutionalized scientist Walter Bishop and his scheming, reluctant son Peter uncover a deadly mystery involving a series of unbelievable events and realize they may be a part of a larger, more disturbing pattern that blurs the line between science fiction and technology.
Cast

Anna Torv
Olivia Dunham

Joshua Jackson
Peter Bishop

Jasika Nicole
Astrid Farnsworth

John Noble
Walter Bishop