Homer Simpson; Marge Simpson; Bart Simpson; Lisa Simpson; Maggie Simpson; Dolph; Janey Powell; Jimbo Jones; Lewis; Milhouse Van Houten; Nelson Muntz; Ralph Wiggum; Sherri; Terri; Agnes Skinner; Chef Luigi; Chief Wiggum; Comic Book Guy [Jeff Albertson]; Crazy Cat Lady [Eleanor Abernathy]; Dr. Julius Hibbert; Dr. Nick Riviera; Edna Krabappel; Groundskeeper Willie; Kirk Van Houten; Krusty the Clown; Lindsey Naegle; Moe Szyslak; Mr. Teeny; Ms. Spot Away; Patty Bouvier; Pimple-Faced Teen; Principal Skinner [Seymour Skinner]; Reverend Lovejoy; Sarcastic Man; Selma Bouvier; Superintedent Chalmers
Synopsis
After Bart plays a prank on Principal Skinner, Skinner orders Bart to let Ralph be his conscience and Ralph begins giving Bart advice everywhere he goes. Meanwhile, Marge begins selling a cleaner that has been in her family for generations and Homer helps her when they start to do commercials on TV.