Observer Sightings are glimpses of an Observer in an episode. An Observer (usually September, but on rare occasions another Observer) appear in each and every episode. Sometimes they are easy to spot because they are the subject matter of an episode. Whether or not an episode revolves around a storyline pertaining to the Observers, however, an Observer can be seen in the background. Some are very easy to spot, while others are particularly challenging to find.
Season 1 [ ]
September can be seen walking outside of Massive Dynamic.
The Same Old Story
September can be seen at the hospital.
The Ghost Network
September can be seen on the train.
September is a part of this episode's storyline. As such, he is seen multiple times throughout this episode. He is tracking the arrival of The Beacon.
September can be seen exiting the elevator at the office building.
September can be seen at the fundraiser.
In Which We Meet Mr. Jones
September can be seen at the airport.
September can be seen on the sidewalk.
September can be seen in the Massive Dynamic hallway.
September can be see on the computer screen showing security footage outside of the bank.
September can be seen outside of Harvard University.
September can be seen observing the car chase on the sidewalk.
September can be seen on the soccer field.
September can be seen on the sidewalk.
September can be seen observing the child.
September can be seen on the news.
September can be seen on the street.
September can be seen in the club.
The Road Not Taken
September meets Walter in the lab. He is central to the episode's storyline.
There's More Than One of Everything
September guides Walter to the beach house. He is central to the episode's storyline.
Season 2 [ ]
A New Day In The Old Town
September crosses the blocked street in front of the empty vehicles from Olivia's crash.
Night Of Desirable Objects
September stands in the field near the Hughes' house, around the time Agent Jessup shows up to investigate.
September receives and reviews photographs of Walter that were delivered by a secretive courier.
September is seen observing Olivia and Charlie's conversation outside of Massive Dynamic Headquarters.
September is seen walking down the stairs in Dr. Nayak's Clinic as Olivia is interviewing the nurse.
September walks behind Broyles at the airport, while he is on the phone to Olivia.
Of Human Action
September is seen observing the police car enter the multi-level parking structure.
September is seen in company of other Observers and watching Olivia in an amusement park.
September walks on Ping-On Street as the triad thug is called to follow Astrid to the lab.
September stands across the street as the tactical team attempts to locate Walter's tracking device.
September walks behind Olivia as she talks to Maureen Donovan outside of St. Brigid's Church.
September is seen standing in the background as the sheriff walks out of his office and the concerned locals from the town are gathered outside.
What Lies Below
September walks behind CDC Field Director McFadden in the tent compound when Level-6 Eradication is being coordinated.
The Bishop Revival
September walks past the window of the diner just before the attack there.
September walks in front of a large fire truck just as Broyles and the fringe team are arriving in front of the building from the alternate universe.
September accidentally distracts Walternate from discovering a cure for the other Peter's illness (in the alternate universe) and subsequently must save Walter and the other Peter from drowning in Reiden Lake (in this universe).
Olivia. In the Lab. With the Revolver
September crosses the street in front of Miranda Green's car, just before she dies of cancerous tumours.
September stands in a doorway near the accident that kills the time-travelling astrophysicist and his fiancée.
The Man from the Other Side
September is standing in line at the bank when Thomas Newton walks up to the teller.
September is standing down the street from Walter's house as Walter comes home, concerned that Peter has not returned.
September is standing behind the police tape with the crowd as Peter meets Sheriff Mathis.
Over There: Part 1
September passes behind Olivia in a bar and drops a file for her to read on the seat next to her.
Over There: Part 2
September passes behind Olivia, Walter and William Bell as they sit and talk at a fast food restaurant in the alternate universe.
Season 3 [ ]
September passes next to Henry's taxicab shortly after Olivia enters the park where she expected to find the parallel universe's version of Massive Dynamic.
September enters the subway station just as Thomas Newton abandons the box in order to visit the lavatory.
September stands on the pedestrian overpass near Milo Stanfield as Milo throws a bicycle from it.
Do Shapeshifters Dream Of Electric Sheep?
September transits the elevator lobby at Massive Dynamic while the Fringe team meets nearby.
September lingers fifteen feet to the left of Olivia's parked vehicle when Agent Francis informs Colonel Broyles that her car is parked near the Riverdale Mutual quarantine site.
September stands with the crowd behind the crime scene tape after Peter discovers that the shapeshifter's dorsal memory chip is broken.
September stands across the street from the diner as Olivia and Henry Higgins wait for breakfast and talk.
September stands outside of Penn Station, next to a taxicab, while Alt-Olivia Dunham meets a shapeshifter to receive harmonic implants.
September stands across the street and reports on the Bishops as they enter Peggy's Malt Shop for a late night treat.
September sets things in motion to prove to December that Walter has changed and would be willing to let Peter go when the time comes.
September stands behind the crowd at the Port Authority as disabled shapeshifter Michael Baird is extracted from the pond.
Concentrate and Ask Again
September saunters into Congressman Thorn's gala fundraiser just before Olivia intercepts the final assassin.
September looks out the window at the Empire Docking Station while Alt-Olivia waits for Frank to return home.
September walks past Chris and Sylvia en route to the Kimball's party.
September walks into the lobby at Bishop Dynamic in the alternate universe, while Alt-Walter Bishop makes his way to his office.
September watches the crime scene with the gathered crowd outside the Metal Depository.
September stands across the street from the science team as they begin to investigate Jim's suicide and Dana's survival.
September watches Brandon intercept a blood sample in the hospital stairwell.
Lysergic Acid Diethylamide
September strolls through the halls of the hospital after Bell/Olivia are wheeled in for treatment.
6:02 AM EST
September walks behind Alt-Olivia and her nanny as they examine Alt-Olivia's child in a square.
The Last Sam Weiss
September walks on the sidewalk behind Peter after his expensive taxicab ride to New York.
The Day We Died
September stands with his colleagues on the grounds of Liberty Island in this universe after Secretary Bishop, Alt-Olivia Dunham and Brandon Fayette crossover from the alternate universe.
Season 4 [ ]
Neither Here Nor There
September meets with his colleagues about the problem they created when they eliminated Peter from the timeline. He creates an electronic device from various components to influence Walter's memory. He is with a colleague near the crime scene following Danzig's murder.
One Night in October
September enters the hospital recovery ward after Olivia chats with the disoriented Professor McClennan.
Alone in the World
September walks in front of Walter's lab building as Olivia and Agent Lee begin to interview young Aaron Sneddon.
September loiters at Reiden Lake as Peter returns to the current timeline from the bottom of the lake.
September waits behind the crime scene perimeter outside of Karen Truss' house when Olivia arrives to join Agent Lee.
And Those We've Left Behind
September walks past the front entrance of Ann's apartment building in Central Village just a few moments before the flash-fire time anomaly reverts five year-old Samantha back into an infant.
September stands in the crowd behind the police tape when Olivia tells Broyles that she and the canine unit failed to locate Eugene.
Back to Where You've Never Been
September gives Olivia a message while she waits at the opera house. He disappears before Olivia can get him to a hospital to treat the bloody wound in his chest.
Enemy of My Enemy
September does not appear in this episode. His colleague walks behind Agent Lee in the plaza as the crowd hurries to collect the money that Jones is distributing during his evasion.
September does not appear in this episode. His colleague stands across the street from Olivia's Apartment while Nina tends to Olivia inside.
September does not appear in this episode. His colleagues are covering his territory. They discover the device September lost at Reiden Lake, and was recovered by Neil Chung.
Welcome to Westfield
September watches Atlantic Flight 591 crash with the stranded motorists near Westfield, Vermont.
A Better Human Being
September walks past the cashier's window at the gas station when Peter enters, looking for Olivia.
The End of All Things
September appears in Walter's lab and collapses from his injury. Peter establishes a synaptic link with him and learns about the role both of them play in the future of mankind.
A Short Story About Love
September reappears to Peter after Peter activates the Beacon device he recovered with clues left for him.
Nothing As It Seems
September walks along the sidewalk behind Peter and Lee as they arrive at the home of the transmogrified Daniel Hicks.
Everything In Its Right Place
September watches Captain Lee escorting Canaan to the secure transport vehicle seconds before the sniper attacks them.
September climbs the stairs behind Jones when Broyles meets him to take the device for Liberty Island.
Letters of Transit
September is not seen in this episode but was referenced as providing key information to Walter when his society was attempting to purge this universe.
September walks near Sally Clark on the shore of Sydney Harbour in New South Wales, one of Jones' planned seismic epicentres.
Brave New World: Part 1
September watches the emergency response outside of the Clane Centre from a semi-restricted view behind the ambulance.