Walter remembers the events in 1985 to Olivia, including how Peter ended up where he is today and what happened to the boy’s mother, Elizabeth Bishop.

When the sole survivor of a building demolished by an earthquake in downtown Manhattan proves to be from the other Earth, Walter leads the team to Jacksonville, the source of a related experiment that he and William conducted years ago. Now only Olivia and the secrets of her past can prevent another catastrophe.

An unseen killer targets a wedding with a toxin that targets specific individuals, and Walter discovers that the case may be tied to a branch on the Bishop family tree.

The Fringe team investigates a mental institution after a patient has brain surgery and begins to show an improvement despite having his brain exposed. Agent Dunham makes a discovery of her own after seeing footage from the surveillance tapes.

The Fringe team closes in on the mysterious Observer after they investigate a bizarre abduction case in Boston, MA.

The Fringe Division investigates an unusual kidnapping with connections to Massive Dynamic.

he Fringe division takes on a puzzling investigation of victims who inexplicably disintegrate into ash. The shadowy case casts light on Special Agent Phillip Broyles’ past and leads the team to the possibility of foreign Fringe science.

The Fringe division investigates the case of a man who attacked his boss in Seattle, believing he was a strange horned creature. While investigating the body, Walter finds a computer chip attached to the thalamus, the part of the brain that controls dreams. This part of the brain is also attached the the motor cortex, leading Walter to believe the chips are being used as mind control. Broyles and Nina Sharp reveal new information which leads to the sleep researcher who implanted the chips. Walter changes his theory; the dreams are being stolen from their hosts to cause a “high” in the person receiving them. The sleep researcher is in fact a dream addict with two personalities. His doctor personality sets a trap so that Olivia and Peter will catch his alternate persona. At the end of the episode, Peter has a nightmare that he can’t remember. The nightmare shows a poster of Space Shuttle Challenger in a mission that never occurred in our reality, suggesting the nightmare is memory from an alternate reality. Guest starring Travis Schuldt.