Charlie calls and says he found a victim with the central endocrine gland removed and wants to know if that counts. Olivia asks him to have the body sent over to the lab. "Will do," says Charlie.
Nice work, Charlie: he manages to get a body transported to the lab, with enough time for Walter to start working on it, in much less time than it takes Peter and Olivia to get back to Harvard.
"Astrid called. She said you had news," says Olivia. That's what the audio says. The closed captioning has Peter saying, "Whatever's going on has something to do with your work, doesn't it?" Anyway, Walter says the pituitary gland has indeed been removed, and he might have a hypothesis about what's happening. It has to with a program he worked on for the defense department, to "cultivate" soldiers: a baby that would, in just three years, be the equivalent of a 21-year-old soldier. Olivia looks horrified. "The only problem was how to slow the aging process once the subject had reached the desired physical age," says Walter. Well, I'm sure that wasn't the only problem. He thinks someone has used his research and had a breakthrough, and this killer is the result: the killer needs to extract the hormones from the pituitary glands of his victims to treat himself and slow the aging process.
So the baby was just a mistake. Aw, no! He wasn't a mistake! You're never supposed to tell the children they were accidents! He was a little miracle! "Even condoms are not one hundred percent effective," Walter says, giving Olivia and Peter concerned looks. Peter's a little old to be embarrassed by his father clinically explaining that Loraine and Buddy "fornicated," too. It's not like Walter used terms like "rumpy-bumpy" or anything. Olivia figures that the painful pregnancy alerted others to Loraine's plight, and Buddy was too scared to kill her there at the motel. She's all grouchy because his MO has changed, which means they have nothing to go on.
She stomps off in a little temper tantrum. "I thought you had a way with women," says Walter to his son. He hasn't even fornicated with this one yet!
Elsewhere, Buddy is stalking around his abandoned factory lair. "Christopher!" yells someone. It's Dr. Penrose, who tells Christopher the FBI came to see him. "You got that girl pregnant," he says. Christopher nods. Penrose hugs him. "Son, we have to be so careful," he says. "Careful" like heading straight to Christopher's hideout after the FBI have made a connection between the two of them? Christopher says the pain's getting worse. "Yes, well, we're almost there. You just need to get one more and you'll be OK again."