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- Season 4 overviewSep 23, 2011-May 11, 201222 episodesSeason 4 episodes1. Neither Here Nor There Sep 23, 2011
- Lincoln Lee joins the team as they investigate a case that he is personally invested in.
- 2. One Night in October Sep 30, 2011
- The Fringe Division gets involved with the investigation of serial murders "Over There."
- 3. Alone in the World Oct 7, 2011
- The Fringe team investigates when the prematurely decomposed bodies of two 12-year-olds are found.
- 4. Subject 9 Oct 14, 2011
- Walter's experiments with a new drug result in a dangerous force; Olivia examines old case files.
- 5. Novation Nov 4, 2011
- As the threat escalates, a former Massive Dynamic scientists gets involved.
- 6. And Those We've Left Behind Nov 11, 2011
- The team searches for a pattern in tragic time-loop anomalies.
- 7. Wallflower Nov 18, 2011
- The team investigates the case of a man who turned white after being killed by an invisible force.
- 8. Back to Where You've Never Been Jan 13, 2012
- Peter journeys to the Other Side to confront Walternate; Olivia receives a dire premonition.
- 9. Enemy of My Enemy Jan 20, 2012
- The alternate Fringe division faces a new adversary in a race against the clock.
- 10. Forced Perspective Jan 27, 2012
- Olivia copes with a warning from the Observers; the team tracks a girl who can predict death.
- 11. Making Angels Feb 3, 2012
- Olivia and Peter search for a killer who is using a toxin that has yet to be invented.
- 12. Welcome to Westfield Feb 10, 2012
- Olivia, Peter and Walter face a terrifying event as they find themselves unable to escape a town.
- 13. A Better Human Being Feb 17, 2012
- The team investigates a mentally ill patient who seems to be connected to a series of murders.
- 14. The End of All Things Feb 24, 2012
- The team takes drastic measures to prevent life-threatening events.
- 15. A Short Story About Love Mar 23, 2012
- After recent events and shocking revelations, Peter considers his options; a killer targets love.
- 16. Nothing as It Seems Mar 30, 2012
- The team investigates a case that Peter recognizes from his world.
- 17. Everything in Its Right Place Apr 6, 2012
- On the other side, Lincoln joins forces with his alternate and Bolivia as they look for a vigilante.
- 18. The Consultant Apr 13, 2012
- Walter goes to the alternate universe to help investigate an event that has ties to both worlds.
- 19. Letters of Transit Apr 20, 2012
- The Observers and the team engage in a battle in the year 2036.
- 20. Worlds Apart Apr 27, 2012
- Both teams fight for the same cause; developments related to the Cortexiphan children arise.
- 21. Brave New World, Part 1 of 2 May 4, 2012
- A fringe event causes people to spontaneously combust; the team faces off with David Robert Jones.
- 22. Brave New World, Part 2 of 2 May 11, 2012
- The team is pushed to its breaking point as it tries to stop a catastrophic event from happening.