It has come down to this on Fringe: William Bell is back, and he may have lost every one of his marbles.
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Olivia is seen here on the season four finale of Fringe. Will she make the ultimate sacrifice?
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It's back to the past for Walter on part one of the Fringe season four finale. He must head back there in order to, you know, save the world.
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New developments come to light for Peter and his team on Fringe. "Worlds Apart" is the 20th installment of the show's 4th season.
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Walter finds out he may have brain damage on this episode of Fringe. "Letters In Transit" is the 19th episode of the 4th season.
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Lincoln and Bolivia go over the case on this episode of Fringe, "The Consultant." It's the 18th installment of season 4.
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Seth Gabel, as Alt. Lincoln, takes aim at a vigilante in this scene from the Fringe episode "Everything in its Right Place." It's the 17th installment of season four.
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Nothing is at it seems on this episode of Fringe, as Olivia, Peter and this bookshop owner - played by Clark Middleton - search for clues.
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This is a scene from the Fringe episode "Nothing As It Seems," taken as we wind down season four.
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Peter has to decide what to do about Olivia, while also investigating a killer, on the episode "A Short Story About Love."
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Hello? This is Peter Bishop. I can't talk right now. I need to save the world.
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Peter and Olivia prepare to look through a storage locker in this scene from the Fringe episode "A Better Human Being."
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Fringe Season 4 Quotes

You know they did a study on sarcastic people, and they get more illnesses than other people. Something to do with negative energy.

Robert Danzig

Fauxlivia: You know, being you and living your life, only me more homesick for my universe.It must be hard to develop trust in people when all you've got is yourself. It must be terribly lonely.
Olivia: Just because you have walked in my shoes, don't you think for a moment that you know me.
Fauxlivia: Yeah, keep telling yourself that.