Lincoln, stammering, wants Walter to do something about it and Walter, laughing like this is self-evident, says, "I can't cure the intermediate stage!" They have to wait until the virus matures and then Walter is eighty percent sure he can counteract it. Lincoln wants to know what happens if he's part of the twenty percent. Well, then there will be a hundred percent whining around the lab, for one thing.

Meanwhile, Markham has found an explanation for the Sumerian tattoo: It means "renewal" or "rebirth" and it's the symbol of a whack job cult that's obsessed with guided evolution of man. "They want to create a new species, a better species. Mutation by design," he says. Peter looks at Olivia in alarm. Yes, apparently the symbol on mutated porcupine man's arm is related to a group that's interested in mutations!

Elsewhere, a woman arrives home doing that thing that people on television do where they walk through a huge dark home and turn on one tiny little lamp while looking at the mail, all the better to let the creature skulking about the shadows to continue to remain unseen.

But then she senses the movement, glimpses something ducking around a corner and nervously approaches. When she finally sees the beast, she gasps -- more out of surprise than fear, it turns out. "Oh, baby, you're hurting," she says, and turns out the one light that's on.

She walks up to Porcupine Man, and gently strokes him, then leans in for an embrace. Then she injects him with something, saying it should be the last one. The beast groans. "Just think how special you're going to be," she says. "How special we're both going to be. Like Adam and Eve." The beast blinks, like, "We're going to have to repopulate the Earth? I didn't say anything about having kids."

So back at the Harvard lab, Olivia, Peter and Astrid are enjoying making fun of Mayan prophecies of serpent ropes and celestial ships. Walter, watching from the other side of the lab whilst also looking into a microscope, takes in the good-natured tomfoolery and says, "It's perfect," and Lincoln thinks Walter's talking about his blood culture, and Walter confesses that he was talking about them: "I hadn't realized how much I longed for family." Lincoln crabbily says that they're great, and Walter hastens to include Lincoln because it's not every day that "a perfectly suited chess partner" comes along.