Fringe, Concentrate and Ask Again

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.

A pair of married scientists 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.

The alternate Fringe division faces new challenges. When a victim has his heart extracted, it's just the beginning of a series of mysterious reanimation events. Meanwhile, Peter comes to terms with his relationship with Olivia.

The team tracks a mysterious girl who can predict death.

The Fringe team becomes trapped in a strange town. Walter becomes concerned for Peter's well-being -- so he turns to Nina for help.

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

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

A series of Fringe events leads the team to the home of a woman grieving over the death of her husband while Peter and Olivia try to repair the emotional rift between them.

The Fringe team tracks a killer targeting love; the team revisits the past.

The Fringe Team's investigating a group of thieves capable of breaking the laws of gravity, and the case is a familiar one for Peter.

Lincoln works a suicide case 'over there' with the Alt Fringe team, discovering a trail leading to a woman that cannot die.

The intensity of life 'over there' accelerates as Olivia finds herself in mortal danger. Walter travels to the Alternate Universe to help Broyles.

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 team makes a desperate, experimental attempt to remove William Bell's consciousness from Olivia's body.

The beginning of the end is triggered when Walternate finds a way to wreak havoc 'over here,' -- putting both universes in jeopardy.

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.

The Fringe team is pushed to their breaking point as they desperately attempt to prevent a catastrophic event threatening the lives of everyone.