Marco the Monkey is employed as a beach officer, but he dedicates much of his time to capturing the affection of the lovely Lulu. Just as he is on the verge of winning her over, his competitor, Carlo, constructs an enormous casino in the shape of a monkey right on Marco’s beach. Lulu becomes enchanted by the charismatic Carlo. Driven by jealousy, Marco embarks on a covert investigation into the peculiar casino owned by Carlo. He soon uncovers Carlo’s true intentions: to seize control of the island and compel Lulu to marry him! When Marco attempts to apprehend Carlo, an unexpected issue arises—literally from beneath the ground—because Carlo’s casino is actually a colossal robot.