High Quality Content by WIKIPEDIA articles! "Homer Defined" is the fifth episode of The Simpsons` third season. It originally aired on the Fox network in the United States on October 17, 1991. In the episode, Homer accidentally saves the Springfield Nuclear Power Plant from meltdown by choosing a button to a counting rhyme. He is honored as a hero and receives praise from his daughter Lisa, but he starts to feel unworthy because he knows that his so-called heroism was just luck. Meanwhile, Bart is downhearted after learning that Milhouse`s mother has forbidden him to spend time with Bart anymore.