While picnicking on a deserted beach, Popeye, Olive and Wimpy decide to "investigake" the wreckage of an old sailing vessel. This decision proves disastrous when the derelict ship turns out to be haunted, filled right up to the crow's nest with gruesome ghosts, dancing skeletons and even "phantom" hamburgers. The climax finds the three picknickers totally at the mercy of the sadistic wraiths, forcing Popeye to take drastic measures--namely, the ingesting of a certain strength-inducing vegetable. The imaginative musical score includes Sam Koslow and W. Frank Harling's lively "Sing You Sinners", originally written for the 1930 movie musical Honey.