A famous scientist invents a humanoid robot (the titular "monster"), so a greedy rival scientist plans to steal it for use in his criminal plans. His henchmen often kidnap a trained gorilla (the titular "ape") from the zoo, to aid in the schemes.

As a child living in Africa, Jill Young saw her mother killed while protecting wild gorillas from po...

A movie serial in 12 chapters: After gold is discovered in the town of Nugget, the titular band of ...

After experimenting on himself and becoming invisible, scientist Jack Griffin, now aggressive due to...

In the 23rd century, inhabitants of a domed city freely experience all of life's pleasures — but no ...

In the future, guns are banned and criminals are frozen for the duration of their sentences. A recen...

Calpuina is a night-watchman in a wharehouse, a perfect job for him. When some thieves break in and ...

Mad scientist brings his dead mad scientist grandfather back to life and makes a Frankenstein-type m...

Al Pereira, a wise-cracking superspy, investigates a series of assassinations being performed by rut...

A mad scientist creates a hideous monster to carry out his murderous plans...

Former Countess Clair and Professor Gruber conduct occult research in castle basement of Count Victo...

A rogue cop must stop a scientist from taking over the world with his deadly female robots, who are ...

Martians fear their children have become lazy and joyless due to their newfound obsession with Earth...

A rich but racist man is dying and hatches an elaborate scheme for transplanting his head onto anoth...

Dr. Laurence, a once-respectable scientist, begins to research the origin of the mind and the soul. ...

A mad scientist crosses plants with people, and the results wind up in a sideshow.

A scientist working on cures for rare afflictions, such as a bone softening agent made from molds to...

A crazed scientist creates a nerve gas that turns the local teenagers into her unquestioning slaves.

Madge Clayton, a society girl, mysteriously disappears. The police suspect a master criminal is behi...

Dr. Henry Jekyll is a well-regarded physician whose evenings are spent researching a rare and sacred...

Prof. Millard pretends to be dead and helps Jeff King ferret out Vulcan, the evil traitor at the sci...