When a perfectly healthy woman is found dead from a disease she never had, the Fringe team investigates the origin of this inexplicably fatal condition before it claims more innocent victims. Meanwhile, Olivia struggles to keep Walter’s secret from Peter, and her loyalty to Peter is tested as time goes on.

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.

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.

Unseen killers target 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.

Unseen killers target 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.

While investigating a case in an office building where a man’s blood literally burst from his arteries and veins, Peter and Olivia are trapped in a CDC quarantine when it’s discovered that the blood carries a deadly pathogen.

While investigating a case in an office building where a man’s blood literally burst from his arteries and veins, Peter and Olivia are trapped in a CDC quarantine when it’s discovered that the blood carries a deadly pathogen.

The Fringe team travels to the town of Edina to investigate a cover-up and are greeted with hostility by the locals. They discover that many of the residents are disfigured, but have managed to hide their deformity… and will to go to any lengths to ensure their secret.