House

A boy in bed, Clancy, calls out for a drink and refuses to go bed. She finally gets him settled down but then he calls out to have his TV on and talks to his dad who also tells him to asleep. Clancy is worried about someone coming to get him. After his dad leaves, Clancy turns on the TV but it starts to flicker, the room shakes, and a bright white light shines in through the window. The next morning the dad comes into find Clancy gone. They search the house, unaware he's lying on the yard bleeding from the rectum.

House goes out for a run but first takes some of his purloined vicodin. Arriving at the hospital, he starts to show some pain and Cuddy and Wilson notice as he comes in. Cuddy wants to tell House about how he cured Richard the brain cancer patient, but Wilson advises that she don't so they can break House from his addiction to puzzles. Clancy has been brought in and they review the symptoms, including Clancy's tale of alien abduction. Chase, a UFO believer, runs some bleeding disorder tests on Clancy, who says he has a metal chip on the back of his neck. Chase plays along with him and pretends to remove the chip, but Clancy sees through it.

Chase doesn't find anything but House has Foreman run the test for a bleeding disorder and it comes up positive. House still thinks Chase screwed up but Cameron suggests the bleeding is on a pattern. Chase goes to run the tests and finds Clancy missing. Chase tracks him down to a room where Clancy is trying to remove his imaginary chip… but it's not imaginary.

The chip is made out of titanium, like a surgical pin that Clancy had removed years ago. Chase wonders how the chip got to his neck but House figures it moved through the body and notes that Clancy's blood is clotting again. While they run more tests, Cameron is downstairs and runs into Richard undergoing physical therapy. She didn't know about his recovery and Cuddy comes in and Cameron figure out what's going on. Cameron confronts Cuddy over it and Cuddy agrees to run a test and if the leg pain is her fault, she'll tell House the truth.

Chase runs another blood test and Clancy starts to hallucinate and have a hypertensive crisis. Cameron suggests the clotting depends on how excited Clancy is. They're going to do an operation to check Clancy's heart but it shows clean. House blows up the recording ever larger and spots some inaction.

Cuddy confronts House about getting the tests and he ripostes by asking her about her pregnancy. He goes to check the tests and they discover the genes in his heart don't match those in the rest of his body.

The team runs a differential diagnosis and Cameron suggests they run a test to "light up" the discrepant DNA. Cameron confronts Wilson and Cuddy over their lie to House. The team run the test and Foreman suspects something is up when Cameron's diagnoses are better than House's. Cameron tells him what's going on but the tests prove negative for a neurological problem. They run a catheter up Clancy's leg to fix the heart problem and remove the damaged cells, then put him to bed for the night.

Wilson gives House some vicodin and suggests he start running. House refuses and Wilson accuses him of avoiding the truth. House later runs on a treadmill privately but the pain overwhelms him and he's forced to take some vicodin. In his room, Clancy hallucinates levitating out of the bed and a bright white light shining through the window. Clancy is actually going through a seizure, and it's back to differential diagnosis. House suggests they put the genetic tag directly into the brain but there's still no sign of neurological problems.

House, showing signs of stress on his leg, goes off on his own to consider the white board. Finally he tells them to send Clancy home once his blood pressure is stabilized--he's stumped for now. Cameron goes to Cuddy and Cuddy confronts House about how he's giving up. House notices something is up and Cuddy is acting guilty and she finally comes clean. At the same time House realizes what's up--Clancy has two sets of DNA because he's "two people." Clancy was created via in vitro fertilization and there's a second set of DNA in the brain. House suggests they electrify the hallucination center of the brain and only the second DNA set (which is responsible for the hallucinations) will activate. Then they can remove the cells and cure him. House needs more current, despite the chance of brain damage, and then confronts Clancy directly to provoke a hallucination. That gives them a clear enough trace to find and remove the cells.

Later House confronts Wilson and tells him about how Cuddy lied to him, but he's figured it's Wilson. House simply walks out after Wilson explains, goes home, and goes back to using his cane.