Peter asks for a list of the doctor's patients. They're in storage in Back Bay, and as he starts rummaging around for the address, Olivia finally asks the important question: "How many are there?" Dr. Frank figures there's about two hundred of them. That's way more than there are voices in Sean's head, but that's because the doctor was constantly modifying the process, and each modification meant another sample group. "And they're all from the same donor, all two hundred," says Olivia.
The doctor hesitates for a moment before saying yes, and Peter half-laughs to himself while Olivia presses on, obliviously asking if that information is also in the storage facility, but Peter's way ahead of her. "It's you, isn't it?" Olivia looks at the doctor, shocked.
Dr. Frank takes off his glasses. "Can you imagine that? The hubris of trying to improve upon god?" he says. Uh, have you met Walter Bishop? Plus every second Fringe case involves some mad scientist toying with knowledge that man was never meant to trifle with, so yeah, Peter and Olivia can imagine it.
Over at Deerfield Hospital, in the cafeteria, Sean is pacing around, relaying the fear and anxiety of the voices in his head, while Astrid writes everything down. "They're worried, they feel threatened," he says, then pauses to listen. "There's a new voice. He's one of the three. He's telling the others to wait, he's coming," he says. Astrid asks where the guy is, but Sean doesn't know. We get to see, however; he's wrapping his arm in a bloody bandage in a dingy bathroom. He looks in the mirror. Looks like he's getting ready for a freestyle rap battle with Eminem and Mekhi Phifer.