1. Neither Here Nor There
Aired: Sep 23, 2011 Just one week after Peter Bishop saved the day and was then wiped from existe...
2. One Night in October
Aired: Sep 30, 2011 The "Over Here" team helps the "Over There" team look into a string of murder...
3. Alone in the World
Aired: Oct 7, 2011 Two bullying boys die and exhibit an alarming state of rapid decay. Their wou...
4. Subject 9
Aired: Oct 14, 2011 Olivia is haunted by an energy force that attracts metallic objects and Walte...
5. Novation
Aired: Nov 4, 2011 Shapeshifter Nadine hunts down a former Massive Dynamics scientist to help re...
6. And Those We've Left Behind
Aired: Nov 11, 2011 The Fringe Division begins to wonder if Peter or his presence is behind a ser...
7. Wallflower
Aired: Nov 18, 2011 A manhunt begins for an invisible killer who steals human pigmentation.
8. Back to Where You've Never Been
Aired: Jan 13, 2012 In an effort to find a way home, Peter journeys to the Other Side to confront...
9. Enemy of My Enemy
Aired: Jan 20, 2012 Peter's visit to the other side intensifies as the alternate Fringe division ...
10. Forced Perspective
Aired: Jan 27, 2012 Olivia continues to cope with the ominous warning from the Observers, while P...
11. Making Angels
Aired: Feb 3, 2012 Our Astrid gets an unexpected visit from her Alternate, while Peter and Olivi...
12. Welcome to Westfield
Aired: Feb 10, 2012 Peter, Olivia and Walter come face to face with a mysterious and terrifying F...
13. A Better Human Being
Aired: Feb 17, 2012 As the Fringe team investigates a mentally ill patient who appears to be conn...
14. The End of All Things
Aired: Feb 24, 2012 Peter and the Fringe team take extraordinary measures in an attempt to stop l...
15. A Short Story About Love
Aired: Mar 23, 2012 The team hunts a killer who seems to be targeting couples - dehydrating the h...
16. Nothing As It Seems
Aired: Mar 30, 2012 An incident occurs that bears remarkable similarities to an early case in the...
17. Everything in Its Right Place
Aired: Apr 6, 2012 Lincoln travels to the other side to join forces with Faulivia and his own al...
18. The Consultant
Aired: Apr 13, 2012 When both of the two identities of people from the separate worlds experience...
19. Letters of Transit
Aired: Apr 20, 2012 In the future, the Observers rule and humans that survived the purge serve th...
20. Worlds Apart
Aired: Apr 27, 2012 Multiple earthquakes are happening simultaneously around both our world and t...
21. Brave New World: Part 1
Aired: May 3, 2012 A mysterious Fringe event, causing people to spontaneously combust, forces Wa...
22. Brave New World: Part 2
Aired: May 11, 2012 In the Season Four finale, the Fringe team is pushed to their breaking point ...