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

As the Observers evaluate Michael and begin to learn of his abilities and potential, Olivia embarks on a dangerous quest to rescue him.

Young Observer's origin is revealed. And his existence and an additional time travel are necessary to change the history of Observers' invasion.

Young observer remains muted. The team seeks Nina Sharp's help to understand him, but the mission is compromised.

Walter Bishop opens Pandora's Box. He finds a young Observer once he has hidden in the Pocket Universe.

Following the bread crumbs, Olivia collects a truck with cargo from a scrap yard but runs into bounty hunters. Peter, with newly gained powers, has to make a decision.

Peter, in the grip of mourning Henrietta's death, resorts to extreme measures in order to gain powers that will allow him to surpass those that the Observers possess and hopefully, and eventually, find a means to defeat them.

Pushed to breaking point, Fringe Division desperately attempts to prevent a catastrophic event orchestrated by David Robert Jones and his hidden associate, Dr. William Bell. Meanwhile, the Observer known as September arrives with a dire warning that will

When a mysterious Fringe event suddenly causes people to spontaneously combust, Walter is forced to revisit his painful past while Fringe Division faces off against David Robert Jones to save the world, or worlds.

When multiple earthquakes strike simultaneously across the globe in both universes, the Fringe teams on both sides unite in their quest to defeat a common foe. As time counts down, the fate of both universes hangs in the balance.

The Observers, no longer content with observing history, return to the past and stage an invasion of 2015, transforming human society in a totalitarian state under their control. In 2036, FBI Agents Simon Foster and Etta Bishop begin a desperate search fo

Walter travels to the Alternate Universe to assist in the investigation of a Fringe event with ties to both worlds. Meanwhile, Alternate Olivia continues her investigation into those responsible for Captain Lee's death, and David Robert Jones reveals his

Heading over to the Alternate Universe, Agent Lincoln Lee and the other Fringe Division track a vigilante who is leaving mutilated corpses in his wake, only to discover a hidden connection to the shapeshifters both universes have been hunting.

Olivia, having willingly accepted the replacement of her memories with those from Peter's timeline, is put under psychiatric evaluation and Lincoln Lee is put in charge of the team in her absence. Under Lincoln's leadership, Fringe Division investigates a

Fringe Division investigates a suspect who is using pheromones to replicate love... but who is killing couples who are in love in order to obtain it. Meanwhile, Olivia tries to deal with the onslaught of memories from her other self, and Peter considers h

As David Robert Jones uses a captive Nina in an effort to activate Olivia's Cortexiphan-enhanced abilities, a dying Observer appears in the lab and forces the Fringe team to take extraordinary measures in an attempt to stop life-threatening events.

As the Fringe team investigates a mentally ill patient who appears to be connected to a series of murders, frightening clues and connections are uncovered that lead Olivia to some shocking revelations.

Peter, Olivia, and Walter come face to face with a mysterious and terrifying Fringe event as they get trapped in a town that there's no escaping from. Meanwhile, Olivia continues to struggle with memories belonging to the Olivia of Peter's timeline.

Our Astrid gets an unexpected visit from her Alternate, while Peter and Olivia track a killer using a toxin that has yet to be invented. Both universes collide in a case that pushes the boundaries of what is possible.

Olivia continues to cope with the ominous warning from the Observers, while Peter and the team track a girl with the mysterious ability to predict death.

Peter and Lincoln's visit to the other side intensifies as the Alternate Fringe Division faces off against a formidable new foe in a harrowing race against time. Meanwhile, Walternate and his wife Elizabeth discuss how best to help Peter return to his own

In an effort to find a way home, Peter journeys to the Alternate Universe to confront Walternate. The venture proves more dangerous than expected when Peter finds himself unexpectedly thrust into the conflict posed by the human shapeshifters. Meanwhile, O

While Olivia struggles with migraines, Fringe Division investigate an invisible force which kills its victims and causes the body to turn a ghostly white. As they trace the pattern of deaths, the team discovers that the force is linked to someone who died

Peter is still being held by Fringe Division who have yet to fully trust him, so when a pattern of tragic time loop anomalies emerges, the team begin to wonder if Peter's unexplained appearance is responsible. Meanwhile, Walter still doesn't believe that

As the threat of the translucent shapeshifters intensifies, former Massive Dynamic biochemical researcher Malcolm Truss enters the fold. Meanwhile, Fringe Division attempts to determine the origins of Peter Bishop, Olivia experiences an unexplained time f

Olivia uncovers a dangerous force that may be connected to Walter's past experiments with the drug Cortexiphan. Their investigation forces Walter to leave the lab for the first time in years as he and Olivia head to Massive Dynamic in New York to examine

The Fringe team investigates when the bodies of two 12-year-olds are found in an advanced state of decomposition just hours after they were last seen bullying another boy. Meanwhile, Walter becomes increasingly distracted by his hallucinations.

As the victims of a highly intelligent serial killer stack up in the Alternate Universe, the Fringe Division "over here" is asked to assist. As the two sides tangle and innocent people remain at risk, the suspect's doppelganger, a professor who teaches Fo

Just 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. Meanwhile, Lincoln Lee joins Fringe Division as they investigate a shapeshifte

After stepping into the machine with the help of Olivia, Peter confronts his destiny, and the team finds itself on unfamiliar ground as the true cost of saving the universe becomes clear.

As the disastrous effects of Walternate's plan to destroy our universe start to manifest, Olivia joins forces with the mysterious Sam Weiss in a desperate race against time.

In the Alternate Universe, when Secretary Bishop finally determines a method to refocus the damaging anomalies in his universe onto this one, the beginning of the end for both universes is triggered.

Back "over here", Walter and Peter embark on a desperate mission inside Olivia's subconscious mind, in an attempt to remove William Bell's consciousness from Olivia's body before her soul is lost forever. Meanwhile, Astrid takes care of Broyles when he's

In the Alternate Universe, Olivia is kidnapped and given a dangerous procedure to accelerate the birth of her child. As the Fringe Division searches for her captors, Lincoln and Charlie learn the truth, that their Olivia and Olivia of the Prime Universe h

When the Fringe team investigates an apparent suicide victim, they uncover a second set of fingerprints leading them to a woman with uncanny characteristics that cannot die. Meanwhile, William Bell, in possession of Olivia's body, promises that no harm wi

The Fringe Team investigates a group of thieves who can break the laws of gravity. Meanwhile, Walter attempts to delay the damage he's caused to the fabric of the universe, and Olivia and Peter test the boundaries of their new relationship.

In a flashback to 1985, Elizabeth Bishop, worried that Peter will attempt to kill himself trying to return to what he believes is his home, takes him to Jacksonville where Walter is conducting Cortexiphan trials on children. Walter discovers that young Ol

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 make an effort to repair the emotional rift between them.

As the story shifts back to life in the Alternate Universe, the absence of Colonel Broyles shifts the dynamic of the Fringe Team as they investigate a bioterrorist armed with an insect that has a taste for human flesh. Meanwhile, alternate Olivia is reuni

When a scientist falls dead after ingesting a lethal cloud of blue powder and his bones disintegrate in his body, the CDC suspects a biological attack. As the Fringe Team investigates further, a subject from Walter's past with ties to Olivia reluctantly a

When the Fringe Team visits Massive Dynamic's assembly of doomsday device, Walter becomes greatly concerned for Peter's well-being, so he turns to Nina for added brain power to understand the relationship between Peter and the superweapon. Meanwhile, the

An Observer unexpectedly makes contact with the Fringe Team to help rectify a mistake. Meanwhile, Walter befriends Roscoe Joyce, keyboardist for Walter's favorite 1970s band, "Violet Sedan Chair." Walter will learn the real reason the band broke up, and r

When the Fringe Team investigates a case where a victim had his heart extracted, it's just the beginning of a series of mysterious and reanimating events tied together. Meanwhile, Peter comes to terms with the reality of his relationship with Olivia.

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.

When a serial kidnapper "over there" strikes again, the emotional and familiar case hits home for Colonel Broyles, sending a determined Olivia to uncover additional details about the abductions. In the meantime, Olivia fights on and reunites with Henry to

Back "over here," Fringe Division investigates a bizarre phenomenon when 15 people up and down the Eastern Seaboard, all suffer retrograde amnesia from listening to their shortwave radios on the same frequency. Much to Walter's dismay, Peter presses on wi

In the Alternate Universe, Fringe Division investigates a shocking breach of security when a twin frees his brother from a quarantined Amber area. As the team sets out to crack this sophisticated case, Walternate begins experimenting with Olivia's ability

Back "over here", Newton is concerned about the consequences of a distressing development involving a high-ranking official, and is forced to call to action a sleeping shapeshifter. As Walter and the rest of the team gather evidence, they move the investi

In the Alternate Universe, timing is everything as a series of anomalous events lead Fringe Division to investigate deadly incidents with unimaginable coincidences. As the freaky crimes continue to occur, the team is in a race against time to protect pote

The story alternates to the Fringe Team "over here" where they investigate a mystifying case that people are discovered in a trance-like state that ultimately leads to their death. The unlikely suspect: a mysterious box. As Peter and Walter collaborate to

After the extraordinary turn of events that shockingly left an imprisoned Olivia stranded in the Alternate Universe, she fights to find a way home. Meanwhile, Peter and Walter try to move on with their lives unknowingly alongside the Olivia from the other

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

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

Peter teams up with a local law enforcement official, Sheriff Mathis, on a serial murder investigation with ties to Newton. Meanwhile, Walter copes with the possibility of being sent back to St. Claire's, and someone from the "other side" pays a visit.

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

When two teenagers on a date turn up "dead" at an abandoned warehouse with the three puncture wounds to the soft palate - a trademark of the shape-shifters - the Fringe team investigates the evidence as well as the motives of mastermind Newton. Upon disco

When passengers aboard a commuter train appear to have died a still death, it seems that a switch was flipped because all cell phones, mp3 players, laptops, batteries and bodies have been drained of power. As the Fringe team assembles at the bizarre crime

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,

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 reaffirms that there is more than one of everything.

A Manhattan office building is rattled to its core, leaving only one survivor, and the Fringe Team examines his otherworldly origins. Once Walter surmises that what shook the building was something he discovered many years ago, the team races to Jacksonvi

When a specific group of guests at a wedding in Brookline, MA, suffocate from the inside out, the upsetting and disconcerting crime scene has the Fringe team investigating how the toxin was delivered and targeted. As evidence is taken into the lab, it's d

When a man enters an office in Boston for a meeting, he becomes disoriented and collapses, only to have his veins erupt and spray blood everywhere. Shortly after Olivia and Peter arrive at the scene to investigate the bizarre case, it's discovered that a

Following an unexplained attack involving disfigured humans, the Fringe team visits Edina City, a small town in upstate New York to uncover leads surrounding the bizarre case. When it's determined that these disfigured people have managed to hide themselv

After a teenage girl is pronounced brain dead, her mother takes her off life support, but when doctors operate quickly to remove her organs, the deceased girl shockingly awakens screaming an alphanumeric code. Equally as perplexing as her resurrection is

A Fringe investigation is triggered when a patient at a mental institution undergoes an impromptu brain surgery that unexpectedly leaves his brain exposed. Despite the unthinkable circumstances, the patient's condition and sanity miraculously improves bef

After a cargo ship runs aground, the shoreline becomes littered with bodies hosting a giant squid-like creature. The Fringe team descends upon the scene to examine the bodies and discovers that the mysterious organisms are actually giant parasites. As the

When a peculiar abduction occurs in Boston, the Fringe team uncovers details of the mysterious man known as The Observer. While the bizarre case takes center stage, Walter, Peter, and Astrid hit the lab to analyze unusual evidence and deal with Walter's i

When a kidnapping rapidly escalates into a hostage situation in New York, local authorities close in on the suspects only to discover a mysterious force with mind-blowing consequences. As the investigation intensifies, the mystery and threat deepen to uni

The Fringe Division is flummoxed by a case where victims are inexplicably disintegrated into ash. The shadowy case casts light on Special Agent Phillip Broyles' past and leads the team to the possibility of foreign Fringe Science. Emotions run high as the

The Fringe team travels cross-country to Seattle after learning of a mysterious incident involving a man who attacked his boss because he believed he was an evil ram-horned creature. As these puzzling occurrences continue, the team tirelessly explores str

Recuperating from the traumatic and alarming meeting with Massive Dynamic founder William Bell, Agent Dunham consumes a powerful fringe concoction that Dr. Bishop prescribes to stimulate her memory. Meanwhile, the Fringe Division investigates a series of

Peter, Walter, Olivia, and Broyles pursue a strange and deadly occurrence in Philadelphia where a bomb blew up inside a train station but left no trace of any explosive device. The perplexing and unexplained set of circumstances returns Walter to the lab

A highway construction worker in rural Pennsylvania goes missing when he is mysteriously drawn into an underground tunnel filled with human remains. Meanwhile, back in the lab, Walter is attempting to simulate travel between realities on frogs. When it's

After her trip to an intriguing Alternate Universe to meet Massive Dynamic founder, William Bell, Olivia's shocking return to this reality pits the team unknowingly in a race against time with an ominous adversary. Pursing information about Olivia's time

David Robert Jones comes out of hiding following an attempt on Nina Sharp's life while Walter leaves accompanied by the mysterious Observer.

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.

Walter examines a number of dead bodies that had the spinal fluid removed. Olivia and Charlie go after the scientist who created the person behind the murders.

FBI agent Dunham believes that she is killing random people in her dreams.

A group of animal rights activists are killed in action when trying to flee from a lab animal which doesn't exist in nature.

A mysterious child is recovered from a secret chamber that has been sealed for more than a half-century.

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.

A man undergoes a painful and ultimately fatal transformation aboard a plane. Meanwhile, Nina Sharp and Broyles reveal more information about John Scott to Olivia.

Two men's brains are liquefied and their only apparent connection is that they both downloaded a huge file before dying.

Olivia has been abducted, and Broyles and the Fringe division must investigate her disappearance - while also undergoing an audit by an agent from Olivia's past who bears a major grudge against her.

After a series of mysterious bank robberies, a suspect is found embedded into a wall, causing Walter to realize that they have not only found a way to literally walk through walls, but are looking for something he's made in the past.

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.

A young musical genius is kidnapped and Walter recalls a patient at St Clair's who might have been kidnapped by the same people and forced to try and figure out the solution to an equation.

An FBI agent experiencing huge pain is brought to a hospital where it is discovered that there is a strange parasite wrapped around his heart.

A number of people in a diner die of radiation exposure and Olivia and the Bishops believe a woman who disappeared two weeks earlier was the source.

An elevator crashes, killing a number of people, leading Olivia and the Bishops to a man who appears to unknowingly be able to manipulate electricity.

A strange cylinder which is somehow connected to Walter and a man known as "the Observer" appears from the ground at a construction site.

Following a strange apparent terrorist attack on a bus, Olivia, Peter and Walter find a man who foresees future disasters before they happen.

A woman gives birth to a baby which ages 80 years in just a few minutes and Olivia soon finds connection between the incident and a serial killer she had been chasing.

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.