Megawatt

From the "Clash Reunion" episode of animated TV series Darkwing Duck (first aired 14 Nov. 1992). Superhero Darkwing Duck (voiced by Jim Cummings), as his mild-mannered secret identity Drake Mallard, attends his high school reunion, only to find out his arch-nemesis, the supervillain Megavolt (voiced by Dan Castellaneta), was also in his class. In a flashback to Megavolt's first appearance, Megavolt crashes the high school prom and announces that he is Megawatt. However, the rock band playing the prom objects- that's their name! So he quickly changes it to Megavolt.