Sacrifices will be made and both universes may never be the same again..

Olivia travels to the parallel universe with Walter

Someone from the “other side” visits.

Walter deals with upsetting news and tells Olivia’s niece a fairy tale.

A shape-shifting embryo is discovered; Peter shares a family secret with Olivia.

Peter remains suspicious of Walter; the investigation leads the team to a a very powerful man

A perfectly healthy woman inexplicably dies

Walter flashes back to 1985 while explaining Peter’s otherworldly origins to Olivia.

Walter leads the team to Jacksonville, the source of a related experiment that he and William conducted years ago. Now only Olivia and the secrets of her past can prevent another catastrophe.

Episode Summary:Olivia returns from the alternate reality and Peter tries to get information about her visit. Walter makes some custard for his son’s birthday, while Broyles deals with the threat of a government shutdown of the Fringe Division.

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Episode Summary:Unseen killers target a wedding with a toxin that targets specific individuals, and Walter discovers that the case may be tied to a branch on the Bishop family tree.