South Park/Adventures of Sonic the Hedgehog

Cast

 * Eric Cartman as Sonic
 * Butters Stotch as Tails
 * Scott Tenorman as Dr. Robotnik
 * Kyle Broflovski as Scratch
 * Stan Marsh as Grounder
 * Kenny McCormick as Coconuts
 * Tweek Tweak as Robotnik Jr.
 * Bebe Stevens as Breezie
 * Liane Cartman as Miss Possum
 * Mr. Testaburger as Lucas
 * Mrs. Testaburger as Lucinda
 * Tweek's Dad as Tails's Dad
 * Tweek's Mom as Tails's Mom
 * Randy Marsh as Wired Earp
 * Gerald Broflovski as Batch Cassidy
 * Stuart McCormick as Billy the Kit
 * Chris Stotch as Chassis James
 * Jimbo Kern as DOS Holiday