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.

Directed by: J.J. Abrams - Joe Chappelle - Alex Kurtzman - Roberto Orci

Writer credits: J.J. Abrams - Alex Kurtzman

Cast: Anna Torv - Joshua Jackson - Lance Reddick - Blair Brown - Jasika Nicole

AKA: Fringe, thedewil, Межа, Spain (Fringe (Al límite))

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