House M.D. Season 1 Episode 21

House's ex-girlfriend Stacy Warner returns-not for House but to get help for her ailing husband, Mark. While House decides whether or not to take her case, Cuddy forces him to present a lecture to a class of medical students. As he weaves the stories of three patients who all present with a similar symptom, House gives a lecture the students will never forget - he discusses three past cases, one of which is more than meets the eye.