When an international flight lands at Boston's Logan Airport and the passengers and crew have all died grisly deaths, FBI Special Agent Olivia Dunham is called in to investigate. After her partner is nearly killed during the investigation, a desperate Olivia searches frantically for someone to help, leading her to Dr. Walter Bishop, our generation's Einstein. There's only one catch: he's been institutionalized for the last twenty years, and the only way to question him requires pulling his estranged son Peter in to help. When Olivia's investigation leads her to a manipulative corporate executive, she and her team will discover that what happened on Flight 627 is only a small piece of a larger, more shocking truth and will explore the blurring line between the possible and the impossible.
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An Enemy of Fate 05x13
While Captain Windmark interrogates Broyles about the intentions of the Fringe team, Donald seeks help from an old friend as he attempts to finish plan to save the world. Elsewhere, Peter, Olivia, Walter, and Astrid prepare face off against the Observers in one extraordinary battle for the fate of mankind.
In a final bid to save their world from the Observers, the Fringe team engages a desperate plan as Olivia embarks on a dangerous and otherworldly journey into the unknown.
The Boy Must Live 05x11
With Michael having revealed the origins of the mysterious figure, Donald, Walter enters the deprivation tank in an attempt to uncover critical information hidden in his subconscious. Meanwhile, Captain Windmark travels to his future of 2609 where he meets with the Observer Commander to discuss September's past transgressions in helping the Fringe team.
Anomaly XB-6783746 05x10
As Windmark continues his investigation into the location of the rogue Fringe team; the team find themselves rapidly running out of time to save the world. As Peter, Olivia, Astrid, and Walter scramble to tap into a key piece of the puzzle to defeat the Observers, they enlist the aid of Nina Sharp who conjures up a risky plan.
Black Blotter 05x09
In attempt to recall a plan to defeat the Observers, Walter takes an LSD trip down memory lane. Meanwhile, Peter and Olivia trace a mysterious signal to the woods, where they come upon a grisly scene.
The Human Kind 05x08
Olivia travels to the town of Fitchburg, looking to recover a key piece of equipment for Walter, where she encounters an intuitive and oracle-like woman named Simone. Meanwhile, Peter finds himself in a perilous situation as he observes Windmark in his personal quest to avenge Etta's death.
In their continued mission to save the world, the rogue Fringe team reaches out to Nina Sharp to help complete the next step of Walter's plan. Meanwhile, Peter begins to understand the precognitive abilities the Observers get from their technological implants, and recruits Anil to test out his newfound skills.
Through the Looking Glass and What Walter Found There 05x06
Olivia reaches out to Peter to mourn their loss together, but grows increasingly concerned with his distant behavior. Meanwhile, Walter continues to follow leads from his video tapes and discovers a key piece needed in the battle against the Observers.
An Origin Story 05x05
As the Fringe team reacts to a devastating loss, a key member resorts to extreme and brutal measures to exact revenge upon the Observers, and to find a way to defeat them by any means necessary.
The Bullet that Saved the World 05x04
As an act of kindness by Peter draws unwanted attention to Etta, Walter discovers the whereabouts of the second component to the Observers' downfall, forcing the team into a hostile and heavily guarded location. Elsewhere, the Observers must deal with a potential infiltrator, and Phillip Broyles resurfaces.