A mad doctor (Bela Lugosi) and his helpers (John Carradine, George Zucco) lure girls to his lab for brain work, to help his wife.
Insurance agent-physician collects on policies of men murdered by a disfigured resident of the home for the blind where he acts as doctor-on-call.
Teenagers try to clear a friend accused of murder.
The owner and staff of a Hollywood nightclub struggle to keep their establishment from closing.
When a police officer is murdered, Captain Street looks to Mr. Wong to catch the killer. Prime Suspect: Frank Belden Jr., whose father is a businessman well known for both his success and dishonesty. Mr. Wong faces increasing danger and is nearly executed himself as the investigation develops in treachery and complexity. As Mr. Wong follows the trail of dead bodies, he uncovers a jewel smuggling ring on the San Francisco waterfront and a case much larger than the death of a police officer.
A scientist keeps his wife young by killing, stealing the bodies of, and taking the gland fluid from virgin brides.
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?
The Range Busters investigate sabotage at a mining community and uncover a gang of Nazi spies.
Chris Morrell, the guardian of half-Indian girl Nina, is helping her find her missing white father. so she can cash in on her late mother's oil lease. Outlaw Sam Black is after the girl and her father as well. Besides dealing with the Black gang, Morrell has to find another robber, Jim Moore, who switches clothes with him after he finds Chris unconscious from a fight with Sam Black. Along the way, he meets a lady who's the sister of Jim Moore, another bad hombre who's in cahoots with Jim Moore, and an old friend who takes in Nina and helps Chris locate Nina's father and fight off the various desperadoes
Four scientists and a newsman crash land on Mars and meet martians who act friendly.
A spoiled New York playboy learns the values of life when he's sent by his father to work in a rural mining community in Canada.
It is prior to the commencement of World War II, and Japan's fiendish Black Dragon Society is hatching an evil plot with the Nazis. They instruct a brilliant scientist, Dr. Melcher, to travel to Japan on a secret mission. There he operates on six Japanese conspirators, transforming them to resemble six American leaders. The actual leaders are murdered and replaced with their likeness.
Slip and Sach take the rap for a robbery they did not commit in order to uncover the real robbers, whom they suspect are led by a convict who gives orders to his gang outside via a short-wave radio stashed somewhere in the prison.
A scientist is turned into an ape man.
Two friends land in hot water when they begin dating twins and one of the women ends up dead.
Bomba the jungle boy swings into action when an elephant herd is threatened by ivory hunters.
Shipping magnate Cyrus Wentworth, downcast over a disaster to his ocean liner 'Wentworth Castle' (carrying, oddly enough, an illicit shipment of Chinese bonds) is shot in his office at the very moment of kicking out his daughter's fiance Dick Fleming. Of course, Captain Street arrests Dick, but reporter Bobbie Logan, the attractive thorn in Street's side, is so convinced he's wrong that she enlists the help of detective James Lee Wong to find the real killer.
Out fishing one day, painter John Hammond and his son Chris come across Bert Hillman, the foreman of a local ranch. He and his ranch hand are searching for a wild dog that killed one of their sheep. They find the animal and kill it, along with one of its puppies, but after they leave Hammond and his son discover another puppy still alive. They take it home and call it Rocky. John believes that a dog descended from sheep-killers will himself become a sheep-killer someday, but e gives his son a chance to raise and train the dog, hoping that he can train the killer instinct from it. Unfortunately, local farmers have reported an epidemic of sheep-killings, and they suspect that Rocky is responsible for them.
A young boy witnesses his father murdered by bandits and grows into adulthood vowing revenge.
After having been swindled out of all their money by a crooked business manager, formerly wealthy socialites Jerry and Carol discover that they owe their chauffeur and maid back wages they are unable to pay. They're forced to let their former employees live in their luxury apartment in lieu of paying the money they owe them.