"House"-hold name: Ron Livingston as Dr. Sebastian Charles. "House"-lights: As a famous doctor who works in Africa, Sebastian is thought to have contracted tuberculosis. He then refuses to take the medication for it, hoping to bring publicity to his story and cause problems for the pharmaceutical companies. But the illness turns out to be caused by a tumor on his pancreas. The entire time, House is barely disguising his jealousy at this clearly brilliant but also attractive and charming doctor. Out-"House": Ron Livingston is best known for his hilarious turn in the 1999 comedy "Office Space."