Stage mentalist Gregor the Great becomes enraged when a drunken audience member belittles his act. When the man dies suddenly, Gregor convinces himself that his hypnotic powers are to blame. Guilt-ridden, he retires from performing to Valerie Monet's wax museum. He becomes increasingly stressed when he is pursued romantically by Valerie, her niece, and his former stage assistant, Maura Daniel. When Valerie mysteriously disappears, it is apparent that sinister forces are at work in the museum.
France, 1640: Cyrano, the charismatic swordsman-poet with the absurd nose, hopelessly loves the beauteous Roxane; she, in turn, confesses to Cyrano her love for the handsome but tongue-tied Christian. The chivalrous Cyrano sets up with Christian an innocent deception, with tragic results. Much cut from the play, but dialogue not rewritten.
After escaping from an asylum the mad Dr. Niemann and his hunch back assistant revive Count Dracula, the Wolf Man and the Frankenstein monster in order to extract revenge upon their many enemies.
Lou Costello plays a country bumpkin vacuum-cleaner salesman, working for the company run by the crooked Bud Abbott. To try to keep him under his thumb, Abbott convinces Costello that he's a crackerjack salesman. This comedy is somewhat like "The Time of Their Lives," in that Abbott and Costello don't have much screen time together and there are very few vaudeville bits woven into the plot.