And now Olivia looks sad, I'm assuming because she thinks she's married to a pervert, and Peter talks about how she could reconsider, and Olivia admits to thinking about it, and that she wishes things were different. "Honey, people still have families. Look at Amanda; she was born into this world, and she's still happy. And the world could get better," says Peter, adding that he thinks they're going to have a child. Olivia forces herself to cheer up and says she hopes he's right, and then Peter starts babbling about how they're going to have two or three, a little tribe of Bishops, and then they are hugging and are now all set to enjoy their disgusting canned steak. And can I just ask why they're bothering to save this world of canned steak? I think the survivors will envy the dead.

The next morning, they're snuggled in bed when Peter's phone rings on his nightstand. It's an excited Walter, explaining that he understands now: "They're splitting atoms -- not as an outcome goal but as a means to an end," he says.

He's discovered that they were made with Strontium-90, which will leave a trail of "radioactive bread crumbs" to whoever's doing that, so they can use Fringe Division's "radiation tracking maps."

And very quickly we're in a wooded campground, where Peter sees terrorists making s'mores, not weapons of mass destruction, but that's where they're detecting the radioactive signal. Olivia seems to think it's a bust, but asks the team to notify her if they find anything out of the ordinary. She's no sooner walked back off to an SUV when an agent brings a little plastic hide-a-key thing to him, saying she found it on a rock. Peter looks at it and frowns, and then quickly tucks it away when Olivia comes back, musing aloud about Walter being wrong. Peter says he's going to head back to check on Fringe's radiation sensors, and he promises to let her know if he finds anything. He gets back in his vehicle, and slides open the Hide-A-Key, revealing an old key inside. He doesn't look happy.

There's a nice overhead shot of Central Park. I'd love to visit some day. So much to see, like Amber Mountain over there. I don't remember seeing that in any tourist brochures... hold on. There are a couple of nefarious-looking dudes approaching the mountain, one of whom is Moreau. At the edge of it, they open the case they're carrying, which holds two of the extra-special souped-up electralites.