House's ex girlfriend, Stacy, asks him to treat her husband. House is forced to take over a diagnostics class for a day by Cuddy. House presents the class with three case studies of leg pain. As House tells his story and the class gradually fills up with listeners. As the story starts to come to a conclusion, it is revealed that the person in the story was not the three individual scenarios but House himself and the story of his leg pain. The class learns how to be a better doctors in the future and House's co-workers learn more about the mysterious Gregory House.
This episode originally aired on May 17, 2005.