Plot

An earthquake from the other side is being felt on our Universe as well. Furthermore, the only survivor seems to be from the alternate Universe. Walter attempts to get Olivia to "recover" her ability to make out things from the other side.

After a violent tremor shakes a Manhattan office building to its core, it leaves only one survivor who leads the Fringe Team to believe he is not from this reality. Walter surmises that what shook the building was not geologic, but rather something discovered by him and William Bell many years ago. With another catastrophe imminent, the team races to Jacksonville, the site of Walter and William's experiments, forcing Olivia to face her mysterious past in an effort to save hundreds of people from certain death.—FOX Publicity

In Manhattan, an earthquake in a building only kills everyone inside but one survivor. The Fringe Division arrives in the spot and finds a second building in the same location and the structure and people merged together. Dr. Bishop concludes that the second building has been brought from the alternate universe using a technology developed by William Bell and him many years ago. Broyles contacts Nina Sharp and the Massive Dynamic helps the investigation trying to identify buildings with similar mass. Meanwhile Dr. Bishop asks Olivia to travel to Jacksonville to revive her experience with Cortexiphan and use her ability to identify the next target. However Olivia is a fearless woman and not the frightened child from the past and the experiment does not work. When they return to New York, Olivia feels that she is frightened again and she identifies the building using her ability. Then she discovers a secret.—Claudio Carvalho, Rio de Janeiro, Brazil

Manhattan

Late at night in an architect's office, a man and woman ride through a "microquake," the sixth in the last few days. The woman leaves and the office starts shaking again. This time, it doesn't stop. Lights and pieces of the ceiling come crashing down and the man falls to the floor. When the dust clears the man looks himself over and finds that not only is he skewered on a piece of the building but he has four arms and legs.

Olivia calls the Bishops in and off they go.

The Fringies plus Broyles head to the building. The outside of the building looks rearranged. They're told there are no survivors. Inside they find bodies melded together.

Walter thinks it was a "quantum tectonic event," atoms separating and re-assembling all wrong. They get calls that there's a survivor. It's the man, Ted Pratchett. He's freaked out and wants them to call his wife.

Olivia asks what happened and he describes tremors.

He says that yesterday dogs started howling.

Walter sees the plans he was working on were for a new Pentagon annex. Broyles reports that Pratchett doesn't have a wife, never did. They assume he's delirious.

Walter asks him a few basic questions, then he asks him what buildings were hit on Sept. 11. He says the Pentagon and the White House. Then he dies. Well, er, almost. They open his shirt and find another head inside his chest and then THAT head dies.

Walter knows his quantum theory was wrong. They're in two buildings, one of which comes from the alternate universe.

Olivia recognizes it as what William Bell warned her Newton was trying to do.

Back at the lab, Astrid is totally skeeved out by the body-in-a-body of Pratchett. Instead she goes through his things. She finds Richard Nixon on a silver dollar and a toy double decker car.

Walter realizes he knows what Newton did. Worse, he's just remembered what's going to happen next.

Olivia finds surveillance photos of Newton and his guys outside the building two hours earlier disguised as a construction crew. Walter calls Peter and demands he and Olivia return to the lab.

He shows them a news clipping of a prank from 30 years ago: supposedly MIT students skewered an intact car on a statue. But Olivia guesses it was really Bishop and Bell experimenting.

Their first test subject was a car. They made one disappear and 12 minutes later, one from the other world appeared. He predicts a building from here will be transported over there within 35 hours. They can't stop it, but maybe they can evacuate it.

He says things jumping worlds take on a glimmer before they go. It's not visible to the naked eye, but gifted Olivia might be able to see it - she's done it before.

Walter tells her about her seeing the glimmer as a child and thinks he can teach her how to do it again - but they have to go to Jacksonville, where they succeeded before with trials of Cortexaphan.

Olivia runs it by Broyles. He's on board. She asks him to look into micro-quakes and he says he'll call Nina at Massive Dynamic.

Jacksonville The old lab/day care is in tact, boarded up and abandoned. Walter remembers the combination, but not its significance. It's 5-20-10, which just happens to be the date the season finale will air.

Walter takes Olivia through the classrooms. In one he tells her 16 items in the room are from the other side. She looks around but notices nothing.

Walter says it's time to start and wanders off muttering that he was hoping to avoid this.

He goes to a room with lots of covered up exam tables and dentist-like chairs.

Peter finds Olivia outside. She's bothered that her typically great memory fails her when it comes to this place.

Walter's ready. He hooks her up and gets the drugs pumping. He warns her she'll face an emotional obstacle once she's under their effects.

Walter asks her to open her eyes. She sees a forest and someone else in it. She walks around, through lush green and a light mist, sunlight streaming through leaves. She gets a little amped up and it turns to night in her vision.

She walks toward someone. It's a young girl who tells her she doesn't want to do this anymore. Olivia tells her she doesn't have to do anything she doesn't want to. The girl runs into the dark and scary woods and Olivia runs after her as wind whips through the trees and dark shadows swoop overhead. She comforts the girl and learns her name is Olive. It's her.

Suddenly the girl is gone. Then she reappears, with scary cat eyes. Olivia screams and wakes up. She immediately asks Walter what the hell is wrong with him, incredulous that he did this to kids.

Back in the classroom, Olivia looks at the objects around her and sees nothing different.

Walter's out of ideas.

Back in New York, Nina walks into a building as dogs bark outside. She calls Broyles. He calls Olivia.

She finds Walter in a classroom watching footage of old experiments with her. He tells her the first time they tried the experiment with her she started a fire with her mind. She says they abused her, but he claims he was trying to help her. She reminds him she was a defenseless child.

He realizes the process didn't work because she's not that scared little girl anymore. She has to try to become her again.

Olivia wanders into another room, with charred walls. She huddles in the corner, but she has a problem: She's not afraid of anything anymore.

The Fringies regroup in New York. The Bishops head off with Nina to look at seismic activity.

Walter pooh poohs analyzing data so Peter suggests they look for a building with the same mass as the first.

They're down to 147 buildings when Walter says it's time. Broyles doesn't think there's anything they can do, evacuations would set off panic.

Olivia finds Peter and is upset that she failed. He reassures her, cradling her face as she cries. He's about to go in for a kiss when she says she's scared. He starts to reassure her again, when she realizes it's an emotional jackpot.

She runs to the patio and looks at the skyline. She sees a building shimmering.

She jumps in her car and drives in the direction of the building as she talks to Broyles on the phone, trying to describe where it is. They narrow it down and call in an evacuation order.

People are running out when Olivia gets there. The force of the building being sucked away knocks her to her feet. She hangs onto a post as is tugged backward as it shakes and is finally sucked into the void, leaving only an empty foundation hole.

Back at the office a news report is calling it a scheduled demolition. Broyles asks what triggered her ability. She says time.

Peter arranges with Astrid to come hang with his dad. He's heading out for drinks with Olivia. Walter's excited, but Peter assures him it's just drinks. Just the same, Olivia primps at her house and lets down her hair.

She arrives at the Bishops and is startled when she sees Peter. He's shimmering, just like the building from the other world. He goes to get his coat and Walter approaches Olivia. "Please don't tell him," he says.