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)