Fearful that buddy Ricky (Dwayne Hickman) will hit on Dee Dee (Annette Funicello) while he's on Naval Reserve duty, Frankie (uncredited Frankie Avalon) gets a witch doctor (Buster Keaton) to send a magical bikini, which is stuffed with beautiful Cassandra (Beverly Adams), to woo away Ricky. And that's just the start of the hi-jinks in this bouncy beach comedy that also stars Mickey Rooney, The Kingsmen, Jody McCrea, and Harvey Lembeck; with a cameo by Elizabeth Montgomery.