Corrected entry: SPOILERS FOR THE FINAL SEASON: The main character's plan is to ensure that the Observers were never created. When the plan is executed, time is reset and Peter and Olivia are back in the park with their daughter. Really think this through: If the Observers never existed, September would've never interrupted Walternate when he discovered The Cure for Peter's illness and Walter would've never crossed over to save him, thus Peter and Olivia would've never met in a world with no Observers. But they are together in the reset timeline.
Fringe (2008)
1 corrected entry in season 5
Starring: Joshua Jackson, John Noble, Anna Torv, Jasika Nicole
Continuity mistake: Charlie, Olivia's former partner and friend in the FBI shows up in this episode during the interview with Mrs. Rusk, but Charlie was killed off by one of the shapeshifters in a previous episode, and the shapeshifter that killed Charlie was himself killed off by Olivia, who in other episodes reflected back on killing him. This episode was supposedly meant to be in season 1 as ep 21 or 22. Unknown why they didn't air it then, and decided to put it in the middle of season 2 (for no apparent reason).
Olivia Dunham: I just want to go back to before.
Phillip Broyles: Dunham, I don't think you can.
Question: In the original timeline, when Fauxlivia and our Olivia are in their opposite universes, the thing that makes our Olivia remember her real life and try to escape is the memory of Peter. In the new timeline, he doesn't exist. When Walternate has found and synthesised the Cortexiphan, he says that our Olivia is no longer necessary and to kill her. How did she get back to our universe with no memories of Peter, and no alternate Broyles helping her to escape and being sent to us dead with one leg?
Answer: In the time line of Season 4, William Bell is trying to destroy both universes to create a new one, and he needs Olivia to power the collapse. So he helped her escape. But the real question is, if not in search of Peter, why Olivia has to travel to the alternate universe to be captured and replaced?
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Correction: But in a world where the Observers take over in the 21st century, there would never be humans to create the first Observers in the future. The time travel in Fringe does not follow conventional time travel rules, allowing for paradoxes. It was frequently stated that the timeline would reset at the moment of the invasion.