The House, M.D. episode built around Gregory House’s lecture on three cases is titled “Three Stories.” It is the 21st episode of the show's first season and uses a nonlinear structure to reveal the origin of House's leg injury.
In the episode, House teaches medical students by presenting three apparently separate patient cases. The cases gradually connect to his own medical history, allowing the audience to learn why he walks with a cane and experiences chronic pain.
“Three Stories” was written by David Shore and directed by Paris Barclay. It became one of the series’ most acclaimed episodes and won the Primetime Emmy Award for Outstanding Writing for a Drama Series.
The title refers to the three case narratives in House's lecture, not to the number of seasons or the number of doctors in his department. Its structure also highlights the show's recurring interest in unreliable assumptions and diagnostic misdirection.