Ben and Holly's Little Kingdom/Nightmare Before Christmas

Cast

 * Numbuh 2 (KND) as Jack Skellington
 * Numbuh 5 (KND) as Sally the Ragdoll
 * Dexter (Dexter's Lab) as Dr. Finklestein (both are scientists)
 * The Mayor (PPG) as The Mayor (both are called by the same title)
 * Scooby (Scooby Doo) as Zero (both are dogs)
 * Ben as Lock
 * Holly as Shock
 * Gaston as Barrel
 * Mandark (Dexter's Lab) as Oogie Boogie
 * Chowder (Chowder) as Santa Claus