The fourth season of the American science fiction television series Fringe premiered on Fox on September 23, 2011 and concluded on May 11, 2012, consisting of 22 episodes. The series is produced by Bad Robot Productions in association with Warner Bros. Television. The show was officially renewed for a fourth season on March 24, 2011.
All episodes — Season 4
S4 E1Neither Here Nor There
Sep 23, 20117.644 min
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. Lincoln Lee joins the Fringe team as they investigate a shapesh
S4 E2One Night in October
Sep 30, 20117.843 min
As the victims of a highly intelligent serial killer "Over There" stack up, the Fringe Division "Over Here" is asked to assist. As the two sides tangle and innocent people remain at risk, the suspect's doppelganger "Over Here," a professor
S4 E3Alone in the World
Oct 7, 20117.344 min
Two young bullies are found dead and in just a few hours they rot to an advanced state of decomposition. The Fringe team investigates and uncovers an amorphous figure claiming more victims. Walter becomes increasingly distracted with his me
S4 E4Subject 9
Oct 14, 20117.844 min
Olivia uncovers a dangerous force that may be connected to past experiments with Cortexiphan. The investigation forces Walter to leave the lab for the first time in years and travel to Massive Dynamic to examine old case files. Walter strug
S4 E5Novation
Nov 4, 20117.443 min
Olivia and the others of Fringe division attempt to determine the origin of Peter Bishop, who purports himself as Walter's son who had died as a young boy in the original time line.
S4 E6And Those We've Left Behind
Nov 11, 20118.244 min
The Fringe team must find the pattern between tragic time loop anomalies. As the investigation unfolds, Raymond, an electrical engineer, and his wife Kate, a professor of theoretical physics, enter the picture.
S4 E7Wallflower
Nov 18, 20117.544 min
When a man mysteriously dies by an invisible force, his body rapidly begins turning ghostly white. The Fringe team learns that this is not an isolated incident, and there’s evidence that links the predator to someone who passed away with an
S4 E8Back to Where You've Never Been
Jan 13, 20128.144 min
In an effort to find a way home, Peter journeys to the Other Side to confront Walternate. However, his venture proves more dangerous than expected. Meanwhile, Olivia receives a dire premonition from an Observer.
S4 E9Enemy of My Enemy
Jan 20, 2012844 min
Peter'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.
S4 E10Forced Perspective
Jan 27, 20127.344 min
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.
S4 E11Making Angels
Feb 3, 20127.744 min
Over Here 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.
S4 E12Welcome to Westfield
Feb 10, 20127.644 min
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.
S4 E13A Better Human Being
Feb 17, 20127.244 min
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.
S4 E14The End of All Things
Feb 24, 20127.844 min
The dying Observer comes to see Walter and Peter, who must take extreme measures to learn what secrets he hides and determine if he knows where Olivia is. Meanwhile, David Robert Jones tries to force Olivia to use her cortexiphan abilities
S4 E15A Short Story About Love
Mar 23, 20127.344 min
Following the recent shocking revelations and emotional events, Peter weighs his options as the Fringe team investigates a killer targeting love.
S4 E16Nothing As It Seems
Mar 30, 20127.144 min
The Fringe team faces a case that appears familiar to Peter. Strangely, it takes place in this timeline.
S4 E17Everything in Its Right Place
Apr 6, 20127.744 min
Lincoln travels to the other side to join forces with Fauxlivia and his own alternate, as they search for a vigilante with a surprising connection to the shapeshifters.
S4 E18The Consultant
Apr 13, 20127.743 min
Walter travels to the Alternate Universe to assist in the investigation of a Fringe event with ties to both worlds. Meanwhile, David Robert Jones reveals his next target.
S4 E19Letters of Transit
Apr 20, 20128.144 min
The Fringe team goes back to the future as the story jumps ahead to 2036, when the Observers and the Fringe team engage in a game-changing battle.
S4 E20Worlds Apart
Apr 27, 20128.444 min
The teams on both sides fight on for a common cause, and there are shocking developments tied to the Cortexiphan children.
S4 E21Brave New World (1)
May 3, 20127.643 min
Walter is forced to revisit his painful past when a fringe event causes people to spontaneously combust; the team faces off with David Robert Jones.
S4 E22Brave New World (2)
May 11, 2012844 min
The Fringe team is pushed to the breaking point as they desperately attempt to prevent a catastrophic event that threatens the lives of everyone.