Dr. Paul Carruthers is frustrated because he thinks his employers, Mary Heath and Henry Morton, have cheated him out of the company's profits. He decides to get revenge by altering bats to grow twice their normal size and training them to attack when they smell a perfume of his own making. He mixes the perfume into a lotion, which he offers as a gift to Mary and Henry. When they turn up dead, a newspaper reporter decides to investigate.

Dr. Bernard Adrian is a kindly scientist who seeks to cure a young woman's polio. He needs human spinal fluid to complete the formula for his experimental serum. Meanwhile, a vicious circus ape has broken out of its cage, and is terrorizing the townspeople. Can there be a connection?

Residents at a posh Utah hotel become suspects when a girl is found murdered during a pool party. Local sheriff Jess Holmes takes charge of the investigation and must discover who among the terrified guests and staff -- including bodacious vixen Harriet Ames, the hotel's bitter, crippled proprietor, visiting lawyer David Hewson and his secretary, Beth -- is the culprit, even as murders continue to take place.

After WW2, a Los Angeles crime ring uses a complex scheme, involving a freight ship, a junkie, and a corrupt health officer, to smuggle drugs into the USA.

A struggling lawyer is named as special prosecutor in a racketeering case.

A university chemistry professor experiments with an ancient Mayan gas on a medical student, turning the would-be surgeon into a murdering ghoul as part of a plan to steal his lover.

Frankie Kelly is the soda jerk and embryo scientist in Midvales only drugstore. Two murders and an attempted killing suddenly swing Midvale into national prominence. Frankie and his pal, Jefferson, become involved when a wounded gangster starts to tell them where $300,000 in stolen loot is hidden, but he is murdered before he can give them all of the information. The search is on.

A spunky young bellhop investigates the murder of a hotel guest.

A honeymoon couple in New York for one night of wedded bliss before he's to join the army, become involved with gangsters after they find a cadaver under their bed.

Aircraft factory worker Barry Kane flees across the United States after he is wrongly accused of starting the fire that killed his best friend.