WATCH: Sneak Peek of all-new FRINGE episode - "Letters of Transit"

FRINGE: Walter (John Noble, R) gets a brain injection in the "Letters of Transit" episode of FRINGE airing Friday, April 20 (9:00-10:00 PM) on FOX 50.

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By FOX50.com

Story Created: Apr 19, 2012 at 5:31 PM EDT

Story Updated: Apr 20, 2012 at 12:05 PM EDT

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The FRINGE tradition of a mind-bending 19th episode continues as the story jumps ahead to 2036, when the Observers and the Fringe team engage in a game-changing battle in the all-new “Letters of Transit” episode of FRINGE airing Friday, April 20 (9:00-10:00 PM) on FOX 50. (FR-419) (TV-14 L, V)

Cast: Anna Torv as Olivia Dunham; Joshua Jackson as Peter Bishop; John Noble as Walter Bishop; Lance Reddick as Phillip Broyles; Blair Brown as Nina Sharp; Jasika Nicole as Astrid Farnsworth; Seth Gabel as Lincoln Lee

BONUS CLIP: In this clip from "Letters of Transit," the observers are among us...and unfortrunately for one guy, they do more than observe.