Marco the Monkey works as a beach officer. But he spends most of his time trying to win the heart of the beautiful Lulu. He is just about to succeed, when Marco's rival, Carlo, builds a gigantic monkey-shaped casino right on Marco's beach. Lulu is fascinated by the charming Carlo. Jealously Marco starts an undercover investigation of Carlo's strange casino. Soon he discovers the truth. Carlo will take over the island and force Lulu to marry him! When Marco tries to arrest Carlo a problem rises. ...