Fred Jones / Scooby-Doo / Presenter / Mecha Mutt (voice)
Shaggy Rogers (voice)
Daphne Blake / Loud Speaker (voice)
Velma Dinkley (voice)
Dr. Devon Albright (voice)
Melanie Staples (voice)
Stan / Mission Control (voice)
Dr. Ned Staples (voice)
Irv (voice)