Frank Welker
Fred Jones / Scooby-Doo (voice)
Mindy Cohn
Velma Dinkley (voice)
Matthew Lillard
Shaggy Rogers (voice)
Grey DeLisle
Daphne Blake (voice)
Gene Simmons
Demon (voice)
Paul Stanley
Starchild (voice)
Eric Singer
Catman (voice)
Garry Marshall
Manny Goldman (voice)
Doc McGhee
Chip McGhoo (voice)
Pauley Perrette
Delilah Domino (voice)
Rachel Ramras
Shandi Strutter (voice)
Penny Marshall
The Elder (voice)
Darius Rucker
The Destroyer (voice)
Jennifer Carpenter
Chikara (voice)
Jason Mewes
Worker #1 (voice)
Kevin Smith
Worker #2 (voice)
Tony Cervone
Announcer (voice)
Tommy Thayer
Spaceman (voice)