As the show opens, Peter visits the Department of Defense in alt-world when an assistant comes in and tells Secretary of Defense Walternate that a high priority individual was admitted to New York General Hospital, the Secretary himself.
In the meantime, William Bell and Olivia get to New York General looking for Walter. Olivia gets to Walter as Bell stalls the just-arrived Bolivia and Charlie. Thanks to the superior healing techniques in alt-world Walter is rejuvenated and feeling well. Bell drives up to help them escape. Bolivia is shocked to see a blonde version of herelf leaving the hospital.
Walternate explains to Peter that his world experienced much worse side effects than the soft spots in the other. They are now reduced to quarantine zones which he believes is Walter’s fault. He also tells Peter that the machine from the schematics can heal both worlds but its power source isn’t working. Bolivia walks in, blowing Peter’s mind, and Walternate confirms to her that the invaders are the parallel versions of themselves, but warns her that they are “monsters in our skin” and that they are the ones who kidnapped Peter.
Bell, Walter and Olivia try to figure how they will get back. If Olivia can open the door, then Bell is sure that Walter can create a “doorstop” to keep it open. Olivia abruptly leaves to find Peter and they agree to meet at the opera house in twelve hours. After Olivia leaves, Bell tells Walter that “she may be our greatest achievement.”
Bolivia brings Peter to his apartment. Bolivia tells him that his kidnapping as a child was a well-known story, and he will be famous. Bolivia asks Peter what “she” is like, and he describes Olivia as haunted.
Bell drives Walter through the New England countryside which is just a barren wasteland in the alternate universe. Bell takes him to Walternate’s lab at Harvard University which is where Walternate unsuccessfully tried to create a way to cross over. Bell explains that on This Side, his alternate version was killed in a car accident at a young age, so the Other Bell and Walternate never met. Bell says that he only came to This Side to prevent the war and he created the shape shifters in order to stay close to Walternate. Yet Walter retorts that Bell is only benefiting himself by fueling the war and founding Massive Dynamic.
Bolivia finds a frantic Olivia back at her apartment, she wants to see Peter. But Olivia softens when she sees a photo of her mother, who is still alive on This Side. Olivia lunges at Bolivia when she sees she has a gun, knocking the gun down. The two women fight and Olivia knocks out her alternate self and ties her up. She then disguises herself to look like Bolivia and uses Bolivia’s computer to find Peter’s location.
At the same time, Walter and Bell find a device that could be the “doorstep” in the lab.
Olivia and Charlie pay a visit to Peter, she hands him the Observer sketch and warns him of the danger that would occur if he returned “There.” Charlie is confused so Olivia knocks him out. Peter realizes that this is not Bolivia.
Peter explains that Walternate told him he was the key to fixing all of This Side’s problems, but he now knows that he was brought back to destroy the other world. Peter is confused because he doesn’t know which Side he belongs on. Olivia says he must come back because he belongs to her and she kisses him.
Bolivia escapes and meets up with Walternate at the Fringe headquarters. They find that Olivia is headed to the opera house so Colonel Broyles sends his teams out to get her.
Walter and bell lug the “doorstop” device into the opera house as Olivia and Peter arrive also. Bell buys them some time by using an advanced weapon against the Fringe team.
Walter gets the device to turn on and Bell agrees to power it for them, essentially offering to kill himself. Walter realizes the gravity of Bell’s offer, and says, “Thank you, old friend.” Bell finally confesses that he removed parts of Walter’s brain because Walter asked him to because he was “afraid of what he was becoming.”
Walter, Olivia and Peter are able to get to the other side just in time and find themselves standing in the calm of the opera house. The real Broyles welcomes them home.
In the lab, Walter asks Peter if he’s back for good. Peter tells him he appreciates that Walter has crossed the universes twice to save him.
Olivia shows up at the antique office equipment store. She’s looking for a Selectric Model 251. She is given the key to the back room. It’s really Bolivia who crossed over. She puts in a piece of paper and types “Infiltration Achieved. Awaiting Orders.”
On The Other Side, Walternate goes to a cell where Olivia (still with Bolivia’s hair) is locked inside and he refuses to release her.
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