Back at the lab, Walter's off his meds or something, because he's wandering around muttering to himself, and when he finally swears and says, "How can I concentrate with you running around?" poor Astrid thinks he's talking to her, but he assures her he's just "thinking out loud," and I really think Astrid needs to get her iPod and just keep her headphones in all the time.

Olivia comes in and asks Walter what he'd need to create a genetic hybrid, like specific things, so she can check to see if Robert Swift bought any of it, and Walter's checklist is as follows: Sodium bicarbonate. A house in the country. "Some Mahler for the late nights." And time, a lot of time. And then Walter wanders off, which is fortunate, because it saves Olivia from killing him. She makes an exasperated face at Peter, who says Walter's been like that all day. All season, actually, but I get what he means. Olivia asks Peter to try to focus him. "Focusing Walter is at the best of times just a matter of degrees," says Peter, like for once just a yes or no answer would be appreciated, and then he says he'll try. By which he means that he gets up and yells at his dad to come back "to the planet Earth" and to focus on something that isn't about him, for once. Walter, looking at a notebook, says he's worried that this is about him, about his work. He shows Peter the book he found in his old files, which is filled with drawings of hybrid animals, like a snake with spider legs. Peter waves Olivia over so she can have a look at it, and then he asks his dad if this is the creature. "No. But I fear it's quite similar," says Walter, explaining that he tried to make it 20 years ago. "Are you saying you created this?" says Olivia, and Walter says he didn't make this one specifically; his experiments were a failure.