When an international flight lands at Boston's Logan Airport and the passengers and crew have all died grisly deaths, FBI Special Agent Olivia Dunham is called in to investigate. After her partner is nearly killed during the investigation, a desperate Olivia searches frantically for someone to help, leading her to Dr. Walter Bishop, our generation's Einstein. There's only one catch: he's been institutionalized for the last twenty years, and the only way to question him requires pulling his estranged son Peter in to help. When Olivia's investigation leads her to a manipulative corporate executive, she and her team will discover that what happened on Flight 627 is only a small piece of a larger, more shocking truth and will explore the blurring line between the possible and the impossible.
When an international flight lands at Boston's Logan Airport with no signs of life, an unlikely trio - FBI Special Agent Olivia Dunham; brilliant but formerly institutionalized scientist Walter Bishop; and his scheming, reluctant son Peter - uncovers a deadly mystery involving a series of unbelievable events and realizes they may be a part of a larger, more disturbing pattern.
Our unlikely trio's strange partnership begins as they investigate the mysterious death of a woman who conceives, carries to full-term, and births a baby in the span of hours, and her baby who ages 80 years in a matter of minutes. As the bizarre and seemingly unexplainable occurrences are explored, quirky Dr. Bishop runs extensive testing in the lab; his reluctant son Peter endures his new role as his father's keeper; and Olivia turns to Massive Dynamic Chief Operating Officer Nina Sharp for assistance.
Our trio investigates a horrific bus incident in which the dead bodies of commuters are frozen inside a bus like insects in amber. Led by the unconventional Dr. Walter Bishop, who requests a piano in the lab to help him process data, the team uncovers a man who has visions of Pattern-related disturbances before they happen, and race to decipher the distraught man's thoughts to prevent another atrocious event from occurring.
After a deadly explosion rocks a construction site in New York City, Broyles solicits the aid of our trio to investigate a strange cylinder mysteriously found at the scene completely unharmed by the surrounding devastation. After Olivia uncovers an unbelievable commonality between disturbing events, Dr. Bishop takes matters into his own hands and Peter is forced into field duty, it almost seems as if the untraceable object is triggering the series of odd behaviors, unexpected events, and surprising revelations.
When it's discovered that a rather simple man has the ability to harness electricity, dangerous and deadly occurrences follow, and our unlikely trio investigates this super-charged oddity. Meanwhile, Olivia has a high-voltage encounter of a different kind when she is rocked by a blast from her past, and Dr. Bishop turns to his feathered friends and enlists homing pigeons to help him break the case.
Weeks after being reported missing, a woman with a rare disease resurfaces in suburban Massachusetts and inexplicably causes excruciating pain and subsequent death to those she encounters. As the gruesome scene is investigated, dangerous levels of radiation are detected, and unusual circumstances surrounding the case point to illegal human drug trials, and possibly something even more sinister. Meanwhile, Walter obsesses about cotton candy, Peter strikes a bargain with Nina Sharp, and a startling piece of Olivia's past is revealed.
Every second counts when a strange, almost-otherworldly parasite mysteriously attaches itself to the internal organs of a dying FBI agent. With a life on the line and strong suspicions of a Pattern connection, Agent Dunham rushes to Germany to meet with an imprisoned man who reveals disconcerting details of a much larger threat. Meanwhile, Peter and Walter attempt to help Olivia by tapping into a dead man's brainwaves.
When a child music prodigy is abducted by a serial kidnapper, it's discovered that a sequence of flashing lights appeared at the abduction, which Walter links back to his bunkmate at St. Claire's Hospital. Much to Peter's dismay, Olivia encourages a return visitation for Walter, and Walter's determination to help ends up having chilling ramifications.
A Massive Dynamic employee is so convinced he is being attacked by butterflies that he jumps out of a window to escape them, and the team is called in to investigate. Although Olivia's unexplained interaction with Agent Scott leads to breaks in the case, she is so desperate to rid her consciousness of him that she demands to go back in the tank. Meanwhile, the gig is up for Peter when a former friend - and some current foes - find out he's back in Boston.
While investigating a series of bank robberies, Olivia, Walter, and Peter are shocked to find one of the suspects inexplicably trapped inside a vault wall as if it solidified around him. Walter realizes that the high-tech thieves have figured out a way to defy the law of physics and that, much to his dismay, the crooks are after something of his. As the investigation unfolds and the mystery deepens, the perilous situation climaxes when a member of the trio is ambushed.
After shifty FBI Agent Mitchell Loeb orchestrated David Robert Jones' otherworldly escape from a German prison and Olivia's alarming abduction, indications of a larger threat begin to emerge. Adding to the intense circumstances, one of Olivia's former adversaries is called in by Internal Affairs to conduct a formal review of the Fringe Division, and Olivia's sister, Rachel, pays a visit. The timing couldn't be more inopportune, as Olivia, Walter, and Peter race against time to solve the wildly grotesque murder of an esteemed epidemiologist - which may link to Olivia's own abduction - before a catastrophic epidemic is unleashed.
Olivia, Walter, and Peter are called in to investigate the death of a car salesman who was found in a pool of "goo," exactly like another man across the country. When Walter discovers that the "goo" is brain matter, the trio tries to figure out how the killer can liquefy human brains. As the deaths pile up, the investigation reveals a common thread linking the victims together in an unthinkable manner. Meanwhile, Olivia is horrified when the case places a loved one in harm's way.
When the Fringe Division delves into another bizarre occurrence aboard an international jumbo jet, freakish remains are discovered at the crash site. Memories tip the team toward some promising leads, but the bigger picture and mysterious threat eludes them. With limited options and insufficient intelligence, Olivia and Peter go undercover.
German agents question Olivia about her "relationship" with David Robert Jones, an escaped prisoner questioned months earlier now on the run in the USA. Meanwhile, the Fringe Division investigates a threatening case where victims die faceless from their orifices suddenly sealing. With few leads and many questions, German authorities turn to Olivia, Peter, and Walter to help makes sense of the return of Mr. Jones and the foreboding mysterious occurrences. As the investigation unfolds, Olivia is put to test.
Just seconds before a building is demolished, a mysterious mute child that has been living alone underground is discovered. When the FBI's Fringe Division investigates, the boy forms an unspoken connection with Agent Olivia Dunham. Meanwhile, an especially gruesome serial killer resurfaces and showcases his "artistry" by displaying his work publicly. As the boy gradually assimilates into a new environment, Olivia and the team must race against the clock to prevent the mad man from further macabre.
When animal rights activists ransack a laboratory, they get more than they bargained for when one of the caged "animals" unleashes a ferocious appetite. Leaving grotesquely mutilated dead bodies in its wake, the scientific engineered beast - with the body of a lion, claws of an eagle, fangs of a viper, skin of a rhinoceros and tail of a serpent - attacks Charlie. With Charlie's life on the line, Walter must come face-to-face with both his past and the beast.
As a suicide incident occurs at New York's iconic Grand Central station, Agent Dunham simultaneously witnesses the event while asleep and dreaming in Boston. Rattled by the extraordinary and coincidental circumstances, Olivia, Peter, and Walter investigate further, but keep coming up empty-handed. As these violent occurrences continue and worsen, Olivia is sent into an unthinkable direction and shocking details emerge about the ZFT manuscript, the highly experimental drug Cortexiphan, and Olivia's childhood.
The Fringe Division is on the case when severely mutilated bodies drained of spinal cord fluid begin to pile up. After their investigation leads them to a scientist with possible ties to the ZFT bio-terrorist cell, they are shocked to discover the identity and motive of the killer. When the kills occur with increasing frequency, Olivia, Peter, and Walter go to desperate lengths to stop them.
Olivia experiences "awake dreams," seeing elaborate visions of things not really there. While investigating a disturbing case of a woman who apparently spontaneously combusted, Olivia throws caution to the wind and explores her unexplained visions further. Meanwhile, Walter discusses key information about the ZFT manifesto, and Peter reveals a secret that yields unexpected results in the case.
With everyone still recovering from the unexpected attack on Nina Sharp, and the return of bio-terrorist David Robert Jones, Fringe Division puts all their efforts into locating William Bell for questioning, whom they believe to be responsible for all the recent fringe events. Meanwhile, accompanied by The Observer, Walter embarks on a mission of his own in an effort to discover important memories that he has lost. As the mysterious events of The Pattern continue to unfold, questions are answered, observations are made, and loyalties are tested to their breaking point.
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 in the Alternate Universe, this new adversary will stop at nothing to discover what Olivia has learned, threatening the lives of anyone who gets in their way.
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 discovered that the disappearance in Pennsylvania is not an isolated incident, the Fringe team travels to the crime scene to unearth evidence.
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 side.
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 study its properties, alternate Olivia turns up the heat on an unsuspecting Peter. Meanwhile, key information about the future is revealed when Walter and Nina meet at Massive Dynamic for the emotional reading of the last will and testament of William Bell.
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 shapeshifter case that is very personal to him.
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 Forensic Psychology, is brought into the fold and forces the team to consider the notion of sending civilians to the other side.
Picking up from the ominous events of last season's Letters of Transit, the year is 2036 and the Observers rule is absolute. The Fringe team - preserved in amber for 20 years - is now a rebel resistance team fighting for freedom. Peter, reunited with his now adult daughter, Etta, sets out to find out what happened to his wife and Etta's mom - Olivia - as they begin their mission to save the world from the Observers.
Determined to retrieve the plan to defeat the Observers from his memory, Walter Bishop tries again with the Thought Unifier to little avail. Olivia suggests the team revisit the old Harvard lab, now under Observer control, to try and find any potential information Walter may have documented as the team fights on in their mission to save the world.
Complete episode guide for Fringe with detailed information about every season and episode including air dates, summaries, ratings, and streaming availability in Japan.
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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 to closely examine the human remains, where he uncovers an unlikely energy source that triggered the explosion. With the explosive threat of more bombs and links to a classified military project, the intense investigation leads Olivia and Peter to Iraq.
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 robbery cases that are tied to shape-shifting. As clues are tracked and memories are jogged, another woman experimented on by Dr. Bishop is introduced and a flashback reveals more about Olivia's visit to the Alternate Universe.
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 strange and creepy links to dreams. In pursuit of additional information, Agent Broyles has a disconcerting meeting with enigmatic Massive Dynamic executive Nina Sharp that leads the investigation in an unthinkable direction.
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 alarming events stack up and revealing personal details emerge about the leader of the Fringe Division.
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 unimaginable proportions when the Fringe Division connects a link between the kidnapping and Massive Dynamic.
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 insatiable appetite for a milkshake.
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 investigation unfolds, Walter heads back to the lab while Olivia, Peter, and Broyles race against time when they realize the case has ties to a threatening organization.
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 before the Fringe team arrives. While Agent Dunham and Peter scan surveillance tapes, Olivia recognizes a familiar face as Thomas Jerome Newton, the leader of the "shape-shifters." As similar cases stack up, the Fringe team heads back to the lab to determine exactly how patients are being cured.
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 that she is now somehow able to speak Russian and possesses classified information only a high-ranking soldier would know. While the girl's mind-bending condition intensifies, Walter dusts off some old lab videos and hypothesizes the unthinkable, sending Olivia and Peter to investigate the bewildering case.
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 themselves for a while and they'll do just about anything to keep it that way, the investigation takes an unexpected turn.
Investigating a lethal virus, Peter & Olivia become isolated inside a quarantined building and face life-threatening circumstances - while the rest of the team tries to save them.
Investigating a lethal toxin that was unleashed on a wedding ceremony as a weaponized experiment, Walter uncovers an alarming formula that reveals a link to the Bishop family tree.
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 Jacksonville to help Olivia reconnect with her past in order to avert what they fear will happen next.
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.
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.
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 scene, Peter remains suspicious that something is amiss with Walter, who is struggling to keep the unimaginable a secret. When the investigation leads them to Alistair Peck, a very powerful man who has tremendous energy with severe consequences, an ironic set of circumstances surface.
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 discovering a shape-shifting embryo, Walter returns to the lab to conduct further analysis, and Olivia and Peter head to Massive Dynamic for answers. Meanwhile, Peter reveals a family secret to Olivia as Walter struggles to recall what Newton knows about "building a door".
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.
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.
Walter and Olivia travel to the Alternate Universe, and the anticipated face-off between Walter Bishop and William Bell occurs.
Sacrifices will be made and both universes may never be the same again after Walter and Olivia visit the "other side".
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 potential victims. Meanwhile, Secretary Bishop shares his strategic plan with Colonel Broyles as Olivia grapples with a heart-stopping vision.
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 investigation to Massive Dynamic, where Olivia goes on high alert and Walter finds himself in a perilous situation.
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 to cross between universes. Meanwhile, visions of Peter continue to haunt Olivia about returning to the "other side".
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 with piecing together the mass destruction device. Just as alternate Olivia and Peter's chemistry deepens, the anticipation of Olivia's return escalates.
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 enlist his services on an intense and covert mission to return home.
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 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.
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 realize that the lives of these two men, who have never met before, overlap in strange and unexpected ways.
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 discovery of a dead body triggers an intense investigation.
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 agrees to assist with the intense case.
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 reunited with Frank, and Walternate remains determined to save his world but discovers there are certain lines he will not cross.
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.
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 Olivia has been able to cross to the "other side", and sees it as a way to return Peter to the Alternate Universe where he belongs.
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.
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 will come to her and he will vacate his temporary residence as soon as he finds a suitable host.
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 had recently temporarily swapped places, and become distrustful of Walternate's agenda for the future of their world.
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 accidentally exposed to LSD in Walter's lab.
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.
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.
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.
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.
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 old case files. Walter struggles with life outside the lab as he confronts the demons of his past.
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 fluctuation, and Nina Sharp pays Walter a visit in the lab.
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 Peter is his son, and Peter attempts to explain his relationship with his Olivia to the Olivia of this timeline.
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 of an unknown genetic disorder.
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, Olivia receives a dire premonition from the Observer, September.
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 timeline.
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.
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.
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.
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.
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.
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 his options in his continued attempt to return to his timeline.
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 case that is eerily familiar to one from the original timeline.
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.
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 next target.
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 for the original Fringe team as the human resistance movement sets the stage for a game-changing battle with the Observers.
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.
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.
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 alter the course of humanity's future.
As the rogue Fringe team continues to fight off the oppressive Observers' invasion, unforeseen events lead them to a forest in rural Pennsylvania, where they encounter a strange subculture of people devoted to recording human history.
As an act of kindness by Peter draws unwanted attention to Etta, Walter discovers the whereabouts of the second component to the Observers' downfall, forcing the team into a hostile and heavily guarded location. Elsewhere, the Observers must deal with a potential infiltrator, and Phillip Broyles resurfaces.
As the Fringe team reacts to a devastating loss, a key member resorts to extreme and brutal measures to exact revenge upon the Observers, and to find a way to defeat them by any means necessary.
Olivia reaches out to Peter to mourn their loss together, but grows increasingly concerned with his distant behavior. Meanwhile, Walter continues to follow leads from his video tapes and discovers a key piece needed in the battle against the Observers.
In their continued mission to save the world, the rogue Fringe team reaches out to Nina Sharp to help complete the next step of Walter's plan. Meanwhile, Peter begins to understand the precognitive abilities the Observers get from their technological implants, and recruits Anil to test out his newfound skills.
Olivia travels to the town of Fitchburg, looking to recover a key piece of equipment for Walter, where she encounters an intuitive and oracle-like woman named Simone. Meanwhile, Peter finds himself in a perilous situation as he observes Windmark in his personal quest to avenge Etta's death.
In attempt to recall a plan to defeat the Observers, Walter takes an LSD trip down memory lane. Meanwhile, Peter and Olivia trace a mysterious signal to the woods, where they come upon a grisly scene.
As Windmark continues his investigation into the location of the rogue Fringe team; the team find themselves rapidly running out of time to save the world. As Peter, Olivia, Astrid, and Walter scramble to tap into a key piece of the puzzle to defeat the Observers, they enlist the aid of Nina Sharp who conjures up a risky plan.
With Michael having revealed the origins of the mysterious figure, Donald, Walter enters the deprivation tank in an attempt to uncover critical information hidden in his subconscious. Meanwhile, Captain Windmark travels to his future of 2609 where he meets with the Observer Commander to discuss September's past transgressions in helping the Fringe team.
In a final bid to save their world from the Observers, the Fringe team engages a desperate plan as Olivia embarks on a dangerous and otherworldly journey into the unknown.
While Captain Windmark interrogates Broyles about the intentions of the Fringe team, Donald seeks help from an old friend as he attempts to finish plan to save the world. Elsewhere, Peter, Olivia, Walter, and Astrid prepare face off against the Observers in one extraordinary battle for the fate of mankind.