Fringe, Alone in the World

One week after Peter Bishop saved the day and was then wiped from existence, the truce between the two worlds remains intact and the two sides are forced to work together.

A highly intelligent serial killer 'over there' forces the two Fringe teams to work together as the killer's doppelganger 'over here' is brought into the fold to help.

The Fringe team investigates a mysterious case of murder and rapid decomposition, uncovering an amorphous figure claiming more victims. Walter's distracted by hallucinations.

When Olivia discovers a dangerous force connected to Walter's past, she forces him to leave the lab for the first time in years and come face-to-face with the demons of his past.

In the aftermath of recent events, things really escalate when the translucent shapeshifters return. As the threat grows, a former Massive Dynamic scientist joins the Fringe team.

A pair of married scientists help the Fringe team uncover a pattern within deadly time loop anomalies.

Investigating a man's death by an invisible force, the Fringe team discovers a serial pattern and evidence that links the predator to someone dead of an unknown genetic disorder.

Trying to find a way home, Peter confronts Walternate on the Other Side -- which proves more dangerous than expected. Meanwhile, Olivia receives a dire warning from an Observer.

Peter's visit to the Other Side intensifies as the alternate Fringe division faces off against a formidable new foe in a harrowing race against time.

Olivia continues to cope with the ominous warning from the Observers, while Peter and the team track a girl with the mysterious ability to see the future and predict death.

Our Astrid gets an unexpected visit from her Alternate, while Peter and Olivia track a killer using a toxin that has yet to be invented. Both universes collide in a case that pushes the boundaries of what is possible.

Peter, Olivia and Walter come face-to-face with a mysterious and terrifying Fringe event as they become trapped in a town there's no escaping from.

As the Fringe team investigates a mentally ill patient who appears to be connected to a series of murders, frightening clues and connections are uncovered that lead Olivia to some shocking revelations.

Peter and the Fringe team take extraordinary measures in an attempt to stop pivotal, life-threatening events from unfolding.

Following the recent shocking revelations and emotional events, Peter weighs his options as the Fringe team investigates a killer targeting love.

The Fringe team faces a case that appears familiar to Peter.

Lincoln travels to the other side to join forces with Bolivia and his own alternate, as they search for a vigilante with a surprising connection to the shapeshifters.

Walter travels to the Alternate Universe to assist in the investigation of a Fringe event with ties to both worlds. Meanwhile, David Robert Jones reveals his next target.

The Fringe tradition of a mind-bending 19th episode continues as the Fringe team goes back to the future. Jumping ahead to 2036, the Fringe team and the Observers engage in a game-changing battle.

The Fringe teams on both sides fight for a common cause as the Cortexiphan children surface with some shocking new developments.

A mysterious Fringe event causing spontaneous human combustion forces Walter to revisit his painful past. Meanwhile, the Fringe team faces off against David Robert Jones to save the world -- or worlds.

In the climactic conclusion of the two-part episode, the Fringe team is pushed to their breaking point as they desperately attempt to prevent a catastrophic event that threatens the lives of everyone.