Recuperating from her alternate reality meeting with William Bell (LEONARD NIMOY), Olivia consumes a powerful "fringe" concoction that Walter prescribes to stimulate her memory.

There's more than one Observer! When one of the series' mysterious Observers kidnaps a woman, the Fringe team is called in to investigate why.

In the Season Three premiere, a disoriented Olivia fights to find her way home, while Peter and Walter try to move on with their lives — unknowingly alongside the alternate Olivia.

When a violent tremor shakes a Manhattan office building and only one survivor is found, Walter surmises that its cause is rooted in his research with William Bell many years ago.

Thomas Jerome Newton is back — and so is evidence of the alternate world's shapeshifters. Peter reveals a family secret while Walter struggles to discern Newton's motives.

While Walter deals with some very upsetting news — he tells Olivia's niece, Ella (LILY PILBLAD), a fairy tale that includes musical performances by Olivia and Agent Broyles.

Timing is critical as a series of anomalous events leads the Fringe Division to investigate deadly incidents with unimaginable coincidences.

Peter grapples with the aftermath of recent events as Olivia desperately searches for an ally. Meanwhile, the Team discovers a critical device that communicates between universes.

Walter and Olivia venture into the alternate world for the anticipated face-off with William Bell (special guest star LEONARD NIMOY) in the first of a two-part season finale.

Destiny and demise collide on the season three finale!

When the Fringe Team visits Massive Dynamic's assembly of the doomsday device, Walter becomes concerned for Peter's wellbeing — so he turns to Nina for help.

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 Alternate Fringe team investigates a bioterrorist armed with an insect that has a taste for human flesh. And Walternate discovers a line he will not cross.

The Fringe Division (over here) investigates a bizarre case when 15 people all suffer retrograde amnesia from listening to their shortwave radios on the same frequency.

Olivia must trust Sam Weiss in a desperate race against time.

The alternate universe Fringe Division investigates a shocking breach of security when a twin frees his brother (guest stars SHAWN and AARON ASHMORE) from a quarantined Amber area.

The team tries to extract Bell's consciousness out of Olivia.

Walternate finds a way to wreak havoc "over here."

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.

Olivia endures life "over there."