Best 'Fringe' Episodes

Walter flashes back to 1985 while explaining Peter's otherworldly origins to Olivia. Also, Peter's mother is introduced, and details of the neighboring world reaffirm that there is more than one of everything.

An earthquake from the other side is being felt on our Universe as well. Furthermore, the only survivor seems to be from the alternate Universe. Walter attempts to get Olivia to "recover" her ability to make out things from the other side.

As the Observers close in, Walter and September desperately work to complete the plan, but one obstacle after another hinders their progress.

Peter and Olivia look into the latest appearance of an observer, other than September, who kidnaps a young woman. August prevents her from getting on a plane that would crash.

With the latest estimate that the team has only one day to save Olivia's consciousness, Walter leads a group on an LSD trip into Olivia's mind.

In the future, the Observers rule and humans that survived the purge serve them. There are still a small number of people fighting for the resistance, and one of them has discovered one of the original Fringe team in the form of Walter protected in amber. As the resistance attempts to get rid of the Observers, we get a glimpse into a rather dark dystopian future.

Peter successfully enters the machine with Olivia's help, and is transported to the future days where Walternate's universe is the one which has been destroyed. Walter learns about the origins of the machine and its ultimate purpose and sends back Peter to change his choice but gets lost in time warp.

Multiple earthquakes are happening simultaneously around both our world and the alt-world. Walter believes he knows what the end game of David Robert Jones is. And, even though Olivia has a connection to one of the players Jones is using that she thinks she can utilize, in the end it leads to some hard decisions for the Fringe team.

Sacrifices will be made and both universes may never be the same again after Walter and Olivia visit the "other side."

Peter and the Fringe team take extraordinary measures in an attempt to stop life-threatening events.

The team investigates a number of people who died faceless after their orifices are sealed while German agents investigating David Robert Jones' escape question Olivia.

The Fringe team investigate a case of spontaneous human combustion. Olivia starts experiencing visions of the alternate Universe. She uses this ability to solve the case.

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.

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

An act of kindness by Peter draws attention to Etta. The Observers deal with an infiltrator, and we learn of a resistance leader known as the Dove and, coincidentally, that Phillip Broyles is working with the Observers.

Walter and Olivia travel to the parallel universe, and the anticipated face-off between Walter Bishop and William Bell occurs.

Walter analyzes the body of a shapeshifter and then reconnects with an old patient that has the ability to distinguish the people from the other world. Olivia finally recalls her encounter with Belly.

Olivia joins forces with the mysterious Sam Weiss in a desperate race against time.

In an effort to find a way home, Peter journeys to the Other Side to confront Walternate. His venture proves more dangerous than expected. Meanwhile, Olivia receives a dire premonition from an Observer.

After a plane from Hamburg returns with no survivors, FBI agent Olivia Dunham goes after the only person that might shed some light on the incident - a scientist that has been in a mental hospital for the last 17 years.

The Fringe division investigate the questionable fall of a Massive Dynamic executive analyst. John helps Olivia crack the case. Peter meets up with an old girlfriend.

Olivia is in a car accident, an unusual person is looking for a member of the team, and Walter makes plans for celebrating Peter's birthday.

The body of a male teenager is found along with shapeshifter marks. Walter examines the embryo of a shapeshifter, that came from the alternate Universe. The team try to anticipate the shapeshifters' next moves.

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

The Fringe Division begins to wonder if Peter or his presence is behind a series of time displacements between 2007 and 2011. Walter imposes a self-exile to his bedroom.