Frank Welker as Scooby-Doo / Fred Jones / Motoshondu (voice) (archive footage)

Casey Kasem as Shaggy Rogers (voice) (archive footage)

Grey DeLisle as Daphne Blake / Shawna (voice) (archive footage)

Mindy Cohn as Velma Dinkley (voice) (archive footage)

Jeff Bennett as Crunchy Granville / Fritz / Mr. Keenan (voice) (archive footage)

Mimi Rogers as Maura Ravenmane / Helga (voice) (archive footage)

Kevin Michael Richardson as Sharky Tazo / Stink Eye (voice) (archive footage)

John Stephenson as Zelig (voice) (archive footage)

Eva Almos as Captain Corvina Cloyd (voice) (archive footage)

John Gabriel as Dr. Armand Zola / Worker (voice) (archive footage)

Mikey Kelley as Monroe Hopper (voice) (archive footage)

Kathy Nagler as Sergeant Linda Rauch (voice) (archive footage)

Steve Harwell as Steve Harwell (voice) (archive footage)

Steve Blum as Rama Yam / Spencer Johnson (voice) (archive footage)

James Arnold Taylor as Frankie Martin / Shawn (voice) (archive footage)