Sometime later -- it's daylight outside now -- Walter tells Olivia that he's asked to have Pratchet's body -- excuse me, bodies -- shipped back to the lab: "Maybe they'll provide some insight into how this thing happened." Olivia says she already knows how it happened. "Two universes colliding," she says, adding that William Bell warned her that Newton would try to open a doorway from our universe to the next, and this would be the consequence when that happened. "Two objects trying to occupy the same space at the same time," says Peter, who hasn't even had the benefit of Nina Sharp's snowglobe demonstration! "This was Newton. I'm sure of it. He was here," says Olivia.
Meanwhile, back at the Harvard lab, Astrid lifts the sheet covering Pratchet's bodies and discovers that she has a limit, and this is it: "I've seen some pretty disturbing things in my time working with you, and I think I've handled them pretty well, but this? I can't do." Walter agrees that it's awful, and suggests she look through the boxes of stuff from the building, looking for anything that might seem out of place, which Astrid happily agrees to do.
She starts pulling stuff out. "I think this qualifies: Richard Nixon on a silver dollar." "That's disturbing," jokes Walter. Astrid asks Walter how, when he separates the bodies, he'll know which one is which. Alternate universe Pratchet was married, so he'll be the one with the wedding ring on his finger, explains Walter, which is awfully presumptuous. What if the alternate universe marks marriage with genital piercing instead? Astrid says, "So as far as his wife will ever know, he just disappeared? That is so sad," she says. Walter agrees, and then Astrid finds a toy double-decker car in the box of effects. "Does this mean that they drive these over there?" she asks. I suppose so, says Walter, who pauses, thinking about something. Astrid asks him what's up. "I know what Newton did. And I'm afraid I've just remembered what's going to happen next," he says.
Meanwhile, Olivia has found a security camera image of Newton at the building two hours before the ... well, whatever you call it, with his men, disguised as a construction crew. "We're running down VIN numbers. We're looking into equipment rental, but I would like to take a crew back to New York," she tells Broyles. Peter's phone rings. It's Walter, demanding that everyone come back to the lab. Peter protests that they're in the middle of something, and Walter is all, "Don't argue with me, son! Get back here now, both of you." Oh, well then.
Back at the lab, Walter's got a 25-year-old newspaper clipping that features a photo of what looks like a car in front of a statue, underneath the headline "MIT FINALLY GOES TOO FAR?" Peter can't believe that's what Walter called them back for; he knows the story, too: "MIT students fused a car to the statue of John Harvard. It was a prank. They had to cut the car away. They never figured out how they did it."
But Olivia's a couple steps ahead of Peter already, and has figured out it wasn't MIT at all but one of Walter's experiments. Walter explains that when he and William Bell first tried to generate a stable door between universes, their first test subject was a car, Bell's old Monte Carlo. "And it did not go well," he says. "First times are always sloppy," says Peter. "It wasn't our first time," says Walter, who JUST SAID it was the first test subject. Anyway, he says that 11 minutes after they made the car disappear, this car appeared from another reality. Peter asks how he knows it wasn't just a car that was pulled from down the block. "It was in 1986. The car had a CD player. It wasn't an option at the time." Oh. Yeah, it makes much more sense that, instead of someone installing a CD player in a car, a car was PULLED FROM AN ALTERNATE REALITY. So much for Occam's razor.
Naturally, Olivia's on board, and she wants to know why a car came from the alternate universe. Walter "explains" that the universe seeks balance. "We sent a car over there, so a car of equal mass came back." It's great that the universe is so specific like that. Walter continues, saying that a building from the other side appeared here, so the "laws of physics demand both sides of the equation balance." Yeah, that's hilarious. The laws of physics certainly apply here. Walter calculates -- based, I guess, on numbers arrived at predicated on the assumption 25 years ago that a car was yanked from an alternate reality -- that a building from this side will be pulled to the other side in just under 35 hours.
Olivia asks how they stop it. You can't, says Walter. "OK, then we need to evacuate the building. So how do we identify which building it's going to be?" she asks, and Walter tells her that he and Belly learned that when objects cross over, they have "an energy," which has been described as a glimmer. "I believe that in the moments before the event when the fabric of the two universes is rubbing together, that the building on this side will begin to take on that glimmer." Except, the glimmer can't be seen by the human eye. "Then how the hell are we going to find it, Walter?" asks an exasperated Peter. Walter says Olivia can see it. She's done it before, he adds. A confused Olivia stares at Walter.
After the commercial break, Walter explains that it was during the Cortexiphan trials that Olivia was the first child with the ability to identify things from the other side. "We gave you the ability," he says, sounding a little too pleased about it for Peter's liking, so Peter points out that they were conducting illegal drug trials on children: "Don't make that sound like charity work."
An increasingly annoyed Olivia says she can't see any glimmer any more. "Because I believe you stopped wanting to. When you did, there were consequences, but I was able to elicit the ability once. I believe I may be able to do again," says Walter, but Peter is quite happy to refuse more experimentation on Olivia's behalf, but she interrupts to say she'll do it, despite Peter's protests. "We don't have time, so just tell me what it is I need to do," says Olivia.
Walter says they need a plane so he can go to Jacksonville to the lab where he and Bell conducted the Cortexiphan trials. It was a day-care centre. Peter points out that Jacksonville is a thousand miles away and whatever they need they can get in Boston, and Walter snaps that what he needs is in Jacksonville. "Jacksonville is where the process worked. If I am able to do it again, it has to be there," he says. Which will turn out to be a) not true, and b) ridiculous anyway, unless Walter's saying that latitude and longitude are variables in the experiment.
Anyway, Olivia is explaining all this nonsense about a building disappearing to Broyles, who wants to know why Walter thinks they need to go to Jacksonville, and Olivia explains that the reason is basically "all Walter's stuff is there." Broyles asks if she's sure that she wants to subject herself to Walter's experiments, and Olivia says, "I don't see another choice," so Broyles asks how he can help, and Olivia explains about the howling dogs and small earthquakes -- Broyles gets momentarily excited until Olivia explains that she's not talking about the Tori Amos album ("That's Little Earthquakes, sir," she says) -- and says Walter thinks they'll happen again before the building disappears. "I'll contact Nina Sharp, ask her to have Massive Dynamic enlist their geologic division to track any seismic activity. Olivia thanks him, and then Broyles is all "Stay in touch," and she promises she will.
So the Fringe team pulls up at the Jacksonville Family Daycare, which apparently has been untouched in this empty strip mall over the past quarter-century. William Bell must still own it. Olivia triple-parks out front, but it's not like there are any customers.
As they get out of the car, Olivia looks around like she's trying to see if anything seems familiar.
Walter opens the combination lock on the door with the sequence 5-20-10. "I always use the same com