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No one has ever called Homer Simpson (voice of Dan Castellaneta) one of the prize employees of the Springfield Nuclear Power Plant, so when there's a potential meltdown of the core, and it falls to Homer to come to the rescue, everyone is pleasantly surprised when he saves the day -- especially Homer, who happened to hit the right button on the control panel through simple dumb luck. Soon, Homer is being hailed as a hero around town, getting congratulatory phone calls from basketball superstar Magic Johnson (who provides his own voice), and is invited to speak on safety at another nuclear plant in Shelbyville. However, Homer feels like a fraud, and is convinced someday people will find out he was lucky, not brave. Meanwhile, Bart (voice of Nancy Cartwright) is short one best friend when Milhouse (voice of Pamela Hayden) is told by his mother that Bart is a bad influence and that he can't spend time with his best friend anymore. "Homer Defined" was first aired on October 17, 1991.