Skip to main content
Comedy Cult Classic

The Earth's last hope against a helmeted gorilla from space with a soft spot for romance.

ROBOT MONSTER

Moon monsters launch attack against Earth! How can science meet the menace of astral assassins? New Science Fiction Thrills!

1953 · 1h 6m · NR · Comedy / Horror / Science Fiction · IMDB TMDB

The monstrous Ro-Man attempts to annihilate the last family alive on Earth, but finds himself falling for their beautiful daughter.

5,471 FilmsIn The Vault
Vault UpdatedDaily
Curated ByHumans
No AlgorithmBullsh*t
Quick Answer
What is Robot Monster about?

Robot Monster is a 1953 United States comedy, horror, and science fiction film directed by Phil Tucker about Ro-Man, an alien creature who has wiped out humanity except for eight survivors, only to find himself conflicted by unexpected feelings for one of them.

Themes & Keywords

Murder Psychotronic Film Blood Death Cult Film Bare Chested Male Explosion Monster Husband Wife Relationship Kiss Surprise Ending Kidnapping Low Budget Film Scientist Nightmare Strangulation

Synopsis

Ro-Man Extension XJ-2 (Barrows), referred to as just Ro-Man (a creature with an ape's body and what is often and erroneously described as a diving helmet for a head), has destroyed all human life on Earth with a Calcinator death ray, except for eight humans who remain alive. The survivors are a Professor (John Mylong), whose name is never mentioned; his wife (Selena Royle); their two daughters, Alice (Barrett) and Carla (Pamela Paulson); their young son, Johnny (Gregory Moffett); the Professor's assistant, Roy (Nader); and space pilots Jason and McCloud (neither of whom is seen or heard). Both pilots depart in a rocket ship for an orbiting space platform. All eight have developed an immunity to Ro-Man's death ray, having received an experimental antibiotic serum developed by the Professor.

Ro-Man must complete the destruction of all humans, even if it means his physically killing them one by one, before his mission to subjugate the Earth is complete. After fruitless negotiations, Ro-Man destroys Jason and McCloud's spaceship, along with the space platform. He later strangles Carla, then tosses Roy over a cliff to his death.

Ro-Man's mission is waylaid, however, when he develops an illogical attraction to Alice and cannot bring himself to eliminate her. Great Guidance (referred to as "The Great One"), leader of the Ro-Man Empire, destroys both Johnny and Ro-Man with a Calcinator blast. The Great One continues the genocide with Cosmic June Rays, which cause prehistoric reptiles to appear (stock footage from the movie 1 Million Years B.C.); and psychotronic vibrations, which "smash the planet Earth out of the universe".

But Johnny is alive, having just awakened from a concussion-induced fever dream. Up to now, all that has happened has just been his nightmare. His sisters, their mother, and the two scientists, whom the family met while picnicking in Bronson Canyon, rejoice at finding him. Johnny and his family invite the scientists home for dinner; they accept.

Suddenly, the Great Guidance, his arms raised in a threatening manner, walks out of the cave directly toward the audience.

Ro-Man, an alien robot who greatly resembles a gorilla in a diving helmet, is sent to earth to destroy all human life. Ro-Man falls in love with one of the last six remaining humans, and struggles to understand how his programming can instruct him to kill her while his heart demands that he can't.
Details & Specs
Director
Phil Tucker
Writer
Wyott Ordung
Release
1953
Runtime
1h 6m
Country
United States of America
Language
English
Also Known As
Monster From Mars, Monsters from the Moon, O Robô Alienígena, Robot Monster (original title)

Why Cult

Gorilla in a Diving Helmet

Ro-Man’s unforgettable look—an ape suit with a space helmet—sets a new standard for sci-fi villain attire.

Apocalypse on a Budget

Experience the end of the world via stock footage, negative film, and visible crew—hallmarks of B-movie ingenuity.

Romantic Monster

This isn’t your average man-versus-robot showdown—the monster falls head over heels for the heroine.

Cult Film Status

From psychotronic oddity to midnight movie staple, Robot Monster’s weirdness has earned it serious cult credentials.

Trailer

Questions from the Vault

What is Robot Monster about? +

Robot Monster follows Ro-Man, an alien with a gorilla body and helmeted head, as he tries to wipe out the last humans on Earth but becomes conflicted when he falls for one of the survivors.

When was Robot Monster released? +

Robot Monster was released in 1953.

Who directed Robot Monster? +

Phil Tucker directed Robot Monster.

How long is Robot Monster? +

Robot Monster has a runtime of 66 minutes.

What genre is Robot Monster? +

Robot Monster is a comedy, horror, and science fiction film.

Where can I watch Robot Monster? +

Robot Monster is available to watch on SassyFlix.

Collection Spotlight

Terror From Beyond!

Why settle for a clean getaway when you can watch the whole thing explode? High-speed pursuits, blown escapes, and metal-crunching wreckage.

Explore Collection →