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.

Two brothers and their surfing buddies face new challenges and adventures over the course of a memorable summer.

A federal witness runs away and a team of government agents track him down, but when they take a shortcut on the return trip, they're attacked by zombies.

A young man finds out that his parents had been used in an atomic-weapons experiment shortly before he was born, and that the results have had some unexpected effects on him.