In the year 2026, Fringe Division attempts to stop a terrorist organization, End of Days, unaware that the head of the organization is receiving help from Walternate, who plans to make sure that This Side is destroyed just as his world was.
Secretary Bishop on the Other Side activates his Machine, triggering devastation on This Side. Peter realizes he has no choice but to enter the Machine and try and break the circuit. Meanwhile, Bolivia resolves to save both worlds by trying to bring Peter back to convince the Secretary to stop the Machine.moreless
Over There, a scientist conducts human experiments involving beetles that eat their way out of their host bodies. Meanwhile, Bolivia reunites with her boyfriend, and Walternate discovers that there are some lines he won't cross.
The CDC calls in the Fringe team to investigate the death of a scientist whose bones were disintegrated by a mysterious blue cloud. Someone from Walter's past reluctantly agrees to assist the team... despite their connection to Olivia.
Walter asks Nina if she can understand the connection between Peter and the doomsday device, while the team visits the assembly of the doomsday device at Massive Dynamic. Meanwhile, a dead body's discovery causes a huge investigation.
The Observer reunites musician Roscoe Joyce with his dead son, setting off a series of events that culminate in a life-or-death test for Walter. Meanwhile, Olivia deals with the repercussions of her absence from This Side, and Walter bonds with Joyce, one of his musical heroes.
Olivia tries to find an ally to help her, while a device allowing communication between the two worlds is uncovered. Meanwhile, Peter tries to deal with recent revelations about the world-destroying device and Bolivia's true identity.
On This Side, 15 people across the Eastern Seaboard suffer amnesia after hearing the same radio frequency, and the Fringe team is called in. Meanwhile, Peter continues to work on the Other Side's mass-destruction weapon and pursue his relationship with "Olivia," unaware of who she truly is.
On the Other Side, a man sets out to free his twin brother from an amber quarantine zone. Meanwhile, Walternate begins the experiments to duplicate Olivia's ability to transition safely between worlds.
Inconsequential acts lead to deadly consequences, and the Fringe Division investigates while Olivia deals with a sinister vision. Meanwhile, Secretary Bishop reveals his plan for Olivia to her commander, Colonel Broyles.
The "real" Earth's Fringe team investigates people who have been put into an unbreakable trance by a mysterious box. Meanwhile, Walter and Nina attend the reading of the last will and testament of William Bell.
Olivia, captured on "the other side," attempts to escape and return to her home world. However, the other side's Walter has other plans, and Olivia soon discovers that she must face a threat from within.
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