Casey Kasem as Shaggy (voice)

Grey DeLisle as Daphne (voice)

Mindy Cohn as Velma (voice)

Kathy Kinney as Sheriff Ellen Perkins (voice)

Frank Welker as Fred / Scooby-Doo / Headless Snowman (voice)

Peter Scolari as Professor William Fagen Higginson (voice)

Mark Hamill as Tommy's Father (voice)

Daryl Sabara as Tommy (voice)

Jim Belushi as Asa Buckwald (voice)