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.