Frank Welker
Scooby-Doo / Fred Jones (voice)
Matthew Lillard
Shaggy Rogers (voice)
Grey DeLisle
Daphne Blake (voice)
Mindy Cohn
Velma Dinkley (voice)
Mark Hamill
Zip Elvin (voice)
Diedrich Bader
H.A.M. (voice)
Malcolm McDowell
Sly Baron (voice)
Fred Tatasciore
Hudson Baron / Alien (voice)
Jennifer Hale
Shannon Lucas / Ridley / Launch Manager (voice)
Jeff Bennett
Colt Steelcase (voice)
Kevin Michael Richardson
Uvinous "U-Boat" Botango / Drake (voice)
Eric Bauza
Clark Sporkman (voice)