The comedy team battles it out with the studio’s roster of bogeymen in a rambunctious fracas that is funny and, at the same time, spine-tingling. Stalking through the piece to add menace are such characters as the Frankenstein Monster, the Wolf Man and Dracula.
Loosely-knit script depicts the Monster growing weak. His master, Dracula, decides to transfer Costello’s brain to the Frankenstein creation. As a lure, the batman uses wiles of Lenore Aubert to soften the fat man and maneuver him into a proper setup.
Through it all runs the Wolf Man as a sympathetic character who tries to warn the heroes against the plot but, unfortunately, proves a bit of a menace himself whenever the moon rises and changes him into a killer.