Between surfing, partying and miming to cheesy songs, Frankie and the gang find time to enter a parachuting competition, meet a mermaid and rescue a girl singer from the clutches of the evil bikers. Another installment in the Frankie and Dee Dee beach adventures. Among the musical numbers, the story involves Frankie going on reserve duty. However, he gets jealous, thinking that Dwayne will steal Dee Dee. So with the help of a witch doctor he sends a sea beauty, Cassandra, to lure Dwayne. But on her arrival the beach turns upside down, as all the surfers fall for her, an executive wants to make her a model, and a motorcycle gang invades.