Roger M. Klotz (voiced by Billy West in the Nickelodeon series, Chris Phillips in the Disney series): Roger is Doug's nemesis/frenemy and a school bully. He is not much of a bully, however, as he usually makes fun of everyone and plays practical jokes. He is older than others in his class, as it took him three years to graduate from sixth grade. Roger has a crush on Doug's sister Judy and in certain episodes tries to woo her. Roger and his divorced mother lived in a trailer park in the Nickelodeon series; in the Disney series, Roger's family becomes wealthy from a real-estate deal struck between the owner of the trailer park and the Bluff family. Roger was inspired from a bully who lived in the same neighborhood as Jinkins. He adopted the bully's neighbors' last name, Klotz, for the character.