Homer Defined is the fifth episode of Season 3. It aired on October 17, 1991. The episode was written by Howard Gewirtz and directed by Mark Kirkland. Basketball player Magic Johnson made a guest appearance in the episode as himself, becoming the first professional athlete to do so on the show.
During a near-fatal meltdown at The Springfield Nuclear Power Plant, Homer frantically presses buttons on his console until he hits the right combination and saves the day. Homer becomes a hero even though he knows in his heart that what he did was a fluke. Meanwhile, Bart’s friendship with Milhouse becomes strained when Milhouse’s mother bars him from hanging out with her son.