Roger M. Klotz (Voiced by Billy West in the Nickelodeon series and by Chris Phillips in the Disney series): Roger is Doug's archrival and the neighborhood thug. Roger and his divorced mother lived in a trailer park in the Nickelodeon series; in the Disney series, Roger's family become wealthy after a real-estate deal struck between the owner of the trailer park and the Bluff family. As the meanie, Roger always tries to poke fun at those around him. Doug uses Roger as a villain in most of his Quailman comics, most notably mad scientist Dr. Klotzenstein. Roger has a crush on Doug's sister Judy, and owns a cat named Stinky who rivals Doug's dog Porkchop. Roger plays lead electric guitar for his band and is also an accomplished ballet dancer, much to Doug's surprise. Despite his nature, he is also portrayed as generally closer to Doug in the second series than in the first, sometimes acting more like a friend. "Joeycookamonga!" is his catchphrase, though it was said only once in the Nickelodeon series. He is normally seen with his three fellow gang members, all of whom together form a rock band called Roger and the Ulcers: