Casey Kasem as Shaggy Rogers (voice)

Frank Welker as Scooby-Doo / Fred Jones / Wiki-Tiki / Interviewer (voice)

Mindy Cohn as Velma Dinkley (voice)

Grey DeLisle as Daphne Blake / Auntie Mahina / Local Woman #2 (voice)

Ray Bumatai as Little Jim (voice)

Tia Carrere as Snookie / Local Woman #1 (voice)

Teri Garr as Mayor Molly Quinn (voice)

Mario López as Manu Tuiama / Mainland Surfer (voice)

Adam West as Jared Moon (voice)

Don Ho as Special Musical Guest (voice)

Dick Dale as Special Musical Guest #2 (voice)

Don Ho as Special Musical Guest #1 (voice)

Dee Bradley Baker as Tiny Tiki / Surfer on Bike / California Surfer Dude / Local Guy #1 / Wild Pig / Gecko / Flame Thrower (voice)

Tom Kenny as Ruben Laluna / California Surfer / Tiny Tiki (voice)