Olivia finishes putting a battery in, and there's a red glow now coming from Peter's heart-shaped box, and there's one more to go. Peter says it must be nice to know who she is, to know her place in the world, and Olivia says, "So what about you?" and Peter says, "Oh, I thought I did. I thought I knew who I was. But I was wrong," because, you know, this episode hasn't been blunt enough in hitting us over the head with everything that's been going on for the past several episodes.

Olivia gets the other battery in, but Peter is not responding anymore. This concerns Olivia so much that she starts singing, and ups the coolness ante by singing some Stevie Wonder -- "For Once In My Life," which was technically a cover, but I'd much rather call it a Stevie Wonder song than a Garth Brooks or Michael Bublé song. Sounds like that's actually Anna Torv singing -- she's no Susan Boyle, but she'll do.

Then, tragically, Peter wakes up. He's thrilled that Olivia fixed him, but still, the batteries won't last long, so they've got to get the heart back. "Those men who attacked us, they work for Nina Sharp," says Peter, but Olivia says it's not Nina Sharp who's got Peter's heart.

It's Walter, who's caressing the heart in his lab when Olivia and Peter show up. "How did you know it was me?" asks a surprised Walter, and Olivia reveals that she saw the torpedo/vibrator in Walter's notebook. FIGURES she'd remember that thing. Olivia strolls over with the box and Walter sadly puts the heart in it, and then Walter -- who's apparently in a motorized chair -- scoots over to plead with Peter that he never meant to hurt anyone, and he promises to change. He starts to sing "The Candy Man," and even in an annoying pseudo-musical story episode John Noble kills it, but Peter says it's too late: "There's some things you can't undo." He and Olivia walk out, leaving Walter alone to continue singing "The Candy Man" to himself. If you, like me, have been irrevocably corrupted by The Simpsons, there's a good chance you sang, "The sanitation folks, are jolly friendly blokes..."

And now Ella is super-pissed, because "that's not a proper ending." She instructs Walter that all good stories start with "once upon a time" and end with "happily ever after." Hee! My daughter's only three, but she gets, like Rush Limbaugh-angry if I try telling her a story that doesn't start with "once upon a time." Anyway, Ella informs Walter that she'll tell him how the story ends, and then we watch again as Walter begs Peter not to leave. And Ella explains that Peter looked deep inside Walter's eyes and saw there was still goodness inside him: "So Peter took his special heart, and with all his might, he split it in two. And the heart was so magical that it still worked." And lo, it is so, and Peter and Olivia cut a rug in the lab while Walter conducts. "And together, they made goodness, and lived happily ever after." Hee. "They made goodness."