In the conclusion of the Season 4 finale, the Fringe team is desperate to prevent a catastrophic event that could cause mass death and destruction.
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Part 1 of 2. Walter reluctantly revisits his painful past after terrifying cases of spontaneous human combustion. Meanwhile, the future of both universes is at stake when the Fringe team faces David Robert Jones in the mother of all battles.
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The Fringe teams from both worlds are united by a common cause; new developments are linked to the children from the Cortexiphan experiments.
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A jump ahead to the year 2036 finds the Fringe team and the Observers as participants in an epic battle.
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Walter goes to the alternate universe to help with the probe of a Fringe event that affects both worlds. Meanwhile, David Robert Jones makes his next target known.
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Lincoln goes to the alternate universe to help Fauxlivia and his own doppelganger hunt for a vigilante who may be linked to the shape-shifters.
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A case is familiar to Peter but brand-new to the rest of the team.
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A killer targeting love is investigated by the Fringe team as Peter tries to decide what to do about Olivia.
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A series of life-threatening events call for extraordinary measures by Peter and the rest of the Fringe team.
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A patient with a mental disorder seems to be linked to a series of murders, but the ensuing investigation helps Olivia discover even more surprises.
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Peter, Olivia and Walter are trapped in a town from which there is no escape during a mysterious Fringe event.
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Astrid gets a surprise visit from her counterpart in the alternate universe; Peter and Olivia are on the trail of a killer equipped with a toxic weapon that defies chronological description.
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Olivia is preoccupied by a warning from the Observers, while Peter helps with the search for a girl with mysterious powers to see the future.
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The alternate Fringe division confronts a powerful new adversary during Peter's visit to the other side.
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Peter takes a dangerous journey to the alternate universe to confront Walternate, while Olivia hears an ominous prediction from an Observer.
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The Fringe team find that the mysterious death of a man—and his corpse turning white—is not unprecedented and may be linked to an unknown genetic disorder. Meanwhile, Olivia is plagued by migraines.
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An electrical engineer (Stephen Root) and his wife (Romy Rosemont), a theoretical physicist, pitch in during a frantic search for a pattern between time-loop anomalies.
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Novation
Season 4, Episode 5
The threatening return of the translucent shape-shifters coincides with the reemergence of a former Massive Dynamic scientist (Arye Gross). Meanwhile, Walter gets a visit in the lab from Nina Sharp.
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Subject 9
Season 4, Episode 4
Walter is wary of leaving the sanctuary of his lab for the first time in years when he and Olivia go to Massive Dynamic in New York to study old files after she discovers a powerful force that may be linked to his Cortexiphan experiments.
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Two 12-year-old bullies are found dead after tormenting another boy, but the abnormally rapid decomposition of their bodies leads to the Fringe team's discovery of a strange entity and a trail of more victims. Meanwhile, Walter's hallucinations are beginning to take their toll.
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The Fringe teams work together when a serial killer "over there" builds an impressive body count, but the case takes an interesting turn after the murderer's alternate identity "over here," a forensic psychologist, is brought into the investigation, which opens up the possibility of transporting civilians from one universe to the other.
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The fourth season begins one week after Peter vanished, and as the two universes maintain an uneasy alliance, Lincoln Lee helps the Fringe team on a shape-shifting investigation that hits close to home.
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