Fringe

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 shocking events, things really escalate when the translucent shapeshifters return. As the threat grows, a former Massive Dynamic scientist joins the team

STEPHEN ROOT and ROMY ROSEMONT guest star as married scientists who help the Fringe team uncover a pattern in 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.

Astrid gets an unexpected visit from her alternate, while Peter and Olivia track a killer using a toxin that has yet to be invented.

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.

Investigating a mentally ill patient connected to a series of murders, Olivia uncovers some frightening connections and shocking revelations.

Peter and the Fringe team take extraordinary measures in an attempt to stop 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. Strangely, it takes place in this world.

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.

In this mind-bending episode, the story jumps ahead to 2036 when the Fringe team strikes back against the Observers 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 case of spontaneous combustion forces Walter to revisit his painful past, while the Fringe team faces off against David Robert Jones to save the world -- or worlds.

In the Season Four finale, the Fringe team is pushed to their breaking point as they desperately attempt to prevent a catastrophic event threatening the lives of everyone.