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.

Moving to the films turning 20 in 2025, the first is Aloha, Scooby-Doo! The film follows the gang ... The gang has to uncover who the Wiki-Tiki spirit is and why it's trying to ruin the surf ...