Frank Welker as Scooby-Doo / Fred Jones / Lachlan Haggart (voice)

Casey Kasem as Shaggy Rogers (voice)

Mindy Cohn as Velma Dinkley (voice)

Grey DeLisle as Daphne Blake / Shannon Blake (voice)

Michael Bell as Duncan MacGubbin / Mcintyre (voice)

Jeff Bennett as Del Chillman / Sir Ian Locksley / Harpoon Gunner (voice)

John DiMaggio as Colin Haggart / Volunteer #1 (voice)

Phil LaMarr as Angus Haggart / Volunteer #2 (voice)

Sheena Easton as Professor Fiona Pembrooke (voice)