In the late 1940s, Universal Monster movies were considered old ... They would stay together for almost a decade longer — after Abbott and Costello Meet Frankenstein‘s somewhat unexpected ...

Bounced off Denny’s police force because of their bungling, Abbott & Costello figure they might be able to get their jobs back if they catch the monster that is terrorizing Hyde Park.

He hires private eyes Abbott and Costello to help him in his mission. When Franz injects himself with a serum possessing powers of invisibility, a flock of amusing sequences are touched off.