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William Bell is back, and playing a big role on the season finale of Fringe. It takes place in the alternate universe and sets the stage for season three. Also, one of our three is left behind!

We're off to the alternate universe on Fringe, as the team travels there in this first-half of the two-part season finale. On "Over There", Walter and Olivia are on a mission to save Peter.

This week's episode is titled "Northwest Passage", where a murder investigation linked to Thomas Newton has Peter helping the local authorities solve these murders. The man from the Other Side also makes an appearance.

This is a very unusual episode of Fringe. Anxiety caused by Peter's disappearance leads Walter to smoke some funky marijuana. Walter then tells Olivia's niece a story, and his imagination becomes the setting for a musical mystery put on by the rest of the Division.

This week's episode is titled "The Man from the Other Side." In it, Newton and his shape-shifter goons are trying to open up a portal into our universe. Peter also learns that he is not from our world, with heartbreaking consequence.

This episode is titled "White Tulip." The Division investigates the deaths of passengers on a commuter train, which is somehow linked to a man's ability to time travel.

This week's episode has a cool name. It's titled "Olivia. In the Lab. With a Revolver." The Division is puzzled by the death of a woman from a disease she apparently never had. Meanwhile, Olivia struggles to keep the secret about Peter to herself.

Ready to see how it all began? This week's episode, "Peter", takes us back to Walter and his younger days. Walter explains to Olivia his experiments from the 1980s and where Peter is truly from.

This week's episode is titled "Jacksonville." A seismic disaster in Manhattan leads Walter to believe it was somehow related to his experiments with William Bell. Agent Dunham must then unlock her ability to save the lives of many.

Wedding guests are found dead on this week's episode titled "The Bishop Revival." When wedding guests mysteriously die, the unit looks into the crime's connections with one of Walter's old experiments.

This week's episode on Fringe is titled "What Lies Below." During it, there's a lethal virus... and it's spreading. Walter, Broyles and Astrid search for answers when Peter and Olivia become trapped in a Boston office that's been quarantined by the Centers for Disease Control because of this deadly virus.

It's off to a small town this week on Fringe. The episode is titled "Johari Window." The team heads to a secluded small town to investigate a mysterious cover-up involving humans with horrible deformities. How far will the town go to keep their secret?

William Bell returns during this episode. The focus returns to The Other Side as the shape-shifters return to steal portions of people's brains.

On this week's episode, the team look into bodies that have creatures attached to them. That's unusual.

It's off to Boston for the Fringe team. This week's episode is titled "August."

We've recapped this episode of Fringe in full. It's titled "Of Human Action."

We've got a complete recap of the latest Fringe episode. Ready to learn all about "Earthling?"

A man has a weird dream and stabs his boss this week. We've got a full recap of the episode.

Welcome back, William Bell. Olivia visits her alternate reality again in this crucial episode of Fringe.

It's a race against time this week on Fringe! The episode is titled "Fracture."

On the season's second episode, the team travels to Pennsylvania. This installment of Fringe is titled "Night of Desirable Objects."

This is the second season premiere of Fringe. The episode is titled "New Day in the Old Town."