The Cast: * Bart as Rocko * Ralph as Heffer * Milhouse as Filburt * Lisa as Sheila * Homer and Marge Simpsons as Rocko's Parents * Mr. Burns as Ed Bighead * Maude Flanders as Bev Bighead * Rod and Todd Flanders as Chuck and Leon * Grandpa Abe Simpson as George Wolfe * Homer Simpson as Rocko * Bart as Spunky * Barney Gumble as Heffer * Ned Flandlers as Filburt * Moe as Ed Bighead * Patty as Bev Bighead * Selma as Virginia Wolfe * Lenny and Carl as Chuck and Leon * Maude Flanders as Dr. Hutchinson * Principal Skinner as George Wolfe * Mr. Burns as Mr. Dupette * Bart as Rocko * Homer as Heffer * Milhouse as Filburt * Lisa as Sheila * Moe as Ed Bighead * Marge as Bev Bighead * Maggie a