The Mystery Gang goes to Hawaii for the Big Kahuna of Hanahuna Surfing Contest. However, the gang and the locals find the island invaded by the vengeful Wiki Tiki spirit and his demons. Casey Kasem, Frank Welker, Mindy Cohn, Grey DeLisle, Ray Bumatai, Tia Carrere, Teri Garr Added on HBO 2022-10-04. Youtube Trailer