"My Brother, Where Art Thou?"  (Season 3 | Episode 5)  20:17
J.D.'s brother, Dan (Tom Cavanagh) comes back to visit and blames Cox for turning J.D. cynical; Dr. Kelso catches Elliot and Carla moonlighting at an animal clinic after forbidding employees from taking other jobs.
Original Air Date: 11/6/2003