House emerges from his room and tells the Cottages to send Clancy home. They cured his blood disorder, stabilized his blood pressure, and removed all the cells they could find. There's nothing left to do. The seizures could be epilepsy or something unrelated and the alien abduction is probably a nightmare. "Send him home," House orders, and leaves the room. The Cottages stare at each other, and then Cameron marches off.
Cuddy finds House in what appears to be the Fox Lot's Galaxy Parking Garage, revving up his motorcycle. I guess Cameron threatened to tell on Cuddy if she didn't tell House the truth herself. Which is better than Cameron tattling to House, so good on her. Cuddy and her string of pearls ask House why he's giving up on Clancy when he usually keeps trying until he figures out what's wrong with his patients. House points out that he was wrong on his last case and he's sulking about it. Cuddy tells him to forget about the last case, and House is a little suspicious as to why Cuddy's suddenly so into this particular case, going so far as to give him permission to remove Clancy's legs and cut his eyes out if it'll make House feel better. That's right, Clancy: it's worth losing your limbs and eyes if it makes Cuddy feel better about lying to House! Cuddy's willingness to let House do whatever he wants this week after refusing to let him do a simple cortisol injection last week does not escape House's notice. "Either you're hormonal or you're guilt-ridden," he says. And since she's not pregnant (please please please), she must have done something wrong. Cuddy looks tortured, then finally tells House the truth about Richard and his Addison's. "You were right," she finishes. House starts telling her unborn and hopefully non-existent child that its mother is a liar, which is why she couldn't get a husband to father it. Cruel, but not entirely undeserved. And then House makes his trademark Breakthrough Case-Solving Realization.
House walks back to the Meeting Room, where the Cottages are waiting for him, as they apparently never get to go home even when their patient is supposed to be fine and about to be discharged. House says that they assumed incorrectly when they thought Clancy was "a person." "What if he's two persons?" House asks. Cameron doesn't get it. House explains with the help of the Magic School Bus Cam: Clancy was conceived via in-vitro fertilization, which increases the risk of twins. "But he doesn't have a twin!" Cameron says. Ah, but wait -- sometimes, very, very early in the pregnancy, one twin will absorb the other and make a chimera -- one person with both his and his sibling's DNA. But even unborn siblings fight with each other, and Clancy and his unborn twin aren't getting along. They have to figure out a way to find and remove the evil brother cells in Clancy's brain. House wants to do this by stimulating Clancy's brain into thinking he's being abducted, causing the good cells to light up and the bad ones to stay dark. They'll cut out the bad cells in a process House calls "really cool brain surgery."