Horror Planet (1981)
"Inseminoid" (original title)

R  |   |  Horror, Sci-Fi  |  November 1982 (USA)
Your rating:
    1 2 3 4 5 6 7 8 9 10 -/10 X  
Ratings: 3.5/10 from 1,979 users  
Reviews: 61 user | 56 critic

A crew of interplanetary archaeologists is threatened when an alien creature impregnates one of their members, causing her to turn homicidal and murder them one by one.



(screenplay), (screenplay)
0Check in

Watch Now

From $2.99 on Amazon Video

2 wins & 1 nomination. See more awards »



Learn more

People who liked this also liked... 

Creature (1985)
Horror | Sci-Fi
    1 2 3 4 5 6 7 8 9 10 4.2/10 X  

A expedition to Titan uncovers an alien being, that goes on a rampage.

Director: William Malone
Stars: Stan Ivar, Wendy Schaal, Lyman Ward
Horror | Sci-Fi
    1 2 3 4 5 6 7 8 9 10 5.3/10 X  

In the distant future, a federation marshal arrives at a research lab on a remote planet where a genetic experiment has gotten lose and begins feeding on the dwindling scientific group.

Director: Allan Holzman
Stars: Jesse Vint, Dawn Dunlap, June Chadwick
Action | Adventure | Horror
    1 2 3 4 5 6 7 8 9 10 5.1/10 X  

SciFi suspense thriller in which a rescue space ship crew meets up with horrors projected by their own imaginations.

Director: Bruce D. Clark
Stars: Edward Albert, Erin Moran, Ray Walston
Contamination (1980)
Adventure | Horror | Sci-Fi
    1 2 3 4 5 6 7 8 9 10 5.3/10 X  

A former astronaut helps a government agent and a police detective track the source of mysterious alien pod spores, filled with lethal flesh-dissolving acid, to a South American coffee plantation controlled by alien pod clones.

Director: Luigi Cozzi
Stars: Ian McCulloch, Louise Marleau, Marino Masé
Horror | Sci-Fi
    1 2 3 4 5 6 7 8 9 10 6.3/10 X  

Alien creatures invade a small town and a group of four teenagers, plus one little boy, try to escape from them.

Director: Douglas McKeown
Stars: Charles George Hildebrandt, Tom DeFranco, Richard Lee Porter
Horror | Sci-Fi
    1 2 3 4 5 6 7 8 9 10 4.9/10 X  

It's the post-apocalypse, and the world has been changed by "the accident," a chemical warfare experiment gone awry. At an isolated subterranean complex, a group of people survives because ... See full summary »

Director: Thierry Notz
Stars: Andrew Stevens, Starr Andreeff, George Kennedy
Alien Prey (1981)
Horror | Sci-Fi
    1 2 3 4 5 6 7 8 9 10 5.2/10 X  

Jessica awakens when an alien spacecraft lands nearby. After dispatching a young couple, the alien assumes the identity of the recently dispatched young man. Jessica and her possessive ... See full summary »

Director: Norman J. Warren
Stars: Barry Stokes, Sally Faulkner, Glory Annen
Escape 2000 (1982)
Drama | Horror | Sci-Fi
    1 2 3 4 5 6 7 8 9 10 5.9/10 X  

Deviants are held at a rehabilitation fortress until they're set into a deadly game of survival, in the hopes of returning to world society.

Director: Brian Trenchard-Smith
Stars: Steve Railsback, Olivia Hussey, Michael Craig
Adventure | Fantasy
    1 2 3 4 5 6 7 8 9 10 3.7/10 X  

The mighty warrior, Kain, crosses the barren wastelands of the planet Ura, where two arch enemies, Zeg and the evil degenerate Balcaz, fight incessantly for control of the village's only ... See full summary »

Director: John C. Broderick
Stars: David Carradine, Luke Askew, Maria Socas
Horror | Sci-Fi
    1 2 3 4 5 6 7 8 9 10 5.7/10 X  

Scientific experiments backfire and produce horrific mutations: halfman, halffish which terrorize a small fishing village by killing the men and raping the women.

Directors: Barbara Peeters, Jimmy T. Murakami
Stars: Doug McClure, Ann Turkel, Vic Morrow
Action | Crime | Thriller
    1 2 3 4 5 6 7 8 9 10 5.5/10 X  

Wifes and children of the Mormon Orville Beecham become victims of a massacre in his own house. The police believes the crime had a religious motive. Orville doesn't give any comment on the... See full summary »

Director: J. Lee Thompson
Stars: Charles Bronson, Trish Van Devere, Laurence Luckinbill
Cut and Run (1985)
Adventure | Horror | Thriller
    1 2 3 4 5 6 7 8 9 10 5.8/10 X  

A reporter and her cameraman connect a surviving Jonestown leader and a TV exec's missing son to a drug war where jungle installations are being massacred by an army of natives and a skilled white assassin.

Director: Ruggero Deodato
Stars: Lisa Blount, Leonard Mann, Willie Aames


Complete credited cast:
Robin Clarke ...
Jennifer Ashley ...
Barrie Houghton ...
Karl (as Barry Houghton)
Rosalind Lloyd ...
Trevor Thomas ...
David Baxt ...
John Segal ...
Kevin O'Shea ...


A group of scientists are working in a lab located on a distant planet. One of them, Sandy, is attacked, raped and impregnated by a monstrous creature. She then begins to stalk her colleagues one by one, killing them and drinking their blood. Written by Marty McKee <mmckee@soltec.net>

Plot Summary | Add Synopsis


Somewhere in the Depth of Space ... A Horrific Nightmare is About to Become a Reality. See more »


Horror | Sci-Fi


R | See all certifications »

Parents Guide:





Release Date:

November 1982 (USA)  »

Also Known As:

Horror Planet  »

Box Office


$2,000,000 (estimated)

Company Credits

Production Co:

Show detailed on  »

Technical Specs

Sound Mix:


Aspect Ratio:

2.35 : 1
See  »

Did You Know?


Feature-film debut of Robert Pugh. See more »


When everyone has blocked themselves into a control room, Sandy decides to blow the door in with explosives near by. When the door flies off, it blows outwards towards her in the corridor, not inwards. See more »


Gary: Damn you woman.
See more »


Referenced in Adjust Your Tracking (2013) See more »

Frequently Asked Questions

See more (Spoiler Alert!) »

User Reviews

Low budget sci-fi/horror features gore galore!!
1 March 2005 | by See all my reviews


Aspect ratio: 2.39:1 (J-D-C Scope)

Sound format: Mono

Whilst exploring a series of caves beneath the surface of Jupiter's moon Xeno, a scientific research team unleashes a long-buried alien creature which impregnates one of the female members of the crew (Judy Geeson). With the subsequent pregnancy developing at an alarming rate, Geeson is compelled to protect her unborn 'children' from scientific scrutiny and begins to massacre her colleagues, one by one...

Responding to the worldwide appetite for overblown space operas established by STAR WARS in 1977, yet remaining true to his roots as a purveyor of exploitation-horror movies (SATAN'S SLAVE, PREY, etc.), British director Norman J. Warren developed the script for INSEMINOID with writers Nick and Gloria Maley, a team of special effects technicians looking for a vehicle in which to showcase their talents. With funding from British and Hong Kong sources, the film went into production at Chislehurst caves (a grim but picturesque location just outside London) shortly after Ridley Scott's ALIEN (1979) wrapped principal photography, though Warren and producer Richard Gordon insist the movie wasn't influenced by Scott's blockbuster in any way.

Unfortunately, INSEMINOID's lofty ambitions are somewhat undermined by its modest £1 million budget, yielding a range of sets, costumes and visual effects which are more reminiscent of "Blake's 7" and "Doctor Who" than STAR WARS, and the cheapskate production values often provoke unintentional laughter. Faced with some fairly amateurish dialogue, most of the cast can't help but sink to the occasion, though Geeson is remarkably good in the leading role, transforming herself from terrified victim to monstrous avenger with scene-stealing glee (unfortunately, she later bad-mouthed the film in no uncertain terms, despite recently admitting she'd never actually seen it!). Stephanie Beacham (SCHIZO, TV's "The Colby's") plays the material with earnest conviction, while Victoria Tennant (THE WINDS OF WAR) makes no impression at all as one of the early victims of Geeson's rampage.

For all its drawbacks, however, the film is fast-moving and eager to please, and benefits enormously from John Metcalfe's expansive scope photography, which Warren uses to evoke a sense of scale at odds with the movie's financial limitations. There's plenty of gory violence on offer, too, though Warren was forced to make a few cosmetic trims to some of the most explicit sequences for censorship reasons in the UK, and it's that version which has prevailed ever since. Sadly, despite the film's modest success (including America, where a slightly truncated print played theatrically under the title HORROR PLANET), the director was unable to finance another venture for several years afterward, and his final film to date, BLOODY NEW YEAR (1987), went straight to video. His long-cherished ambition to remake FIEND WITHOUT A FACE (1957) has yet to happen, which is particularly regrettable - the genre has always needed talented mavericks like Warren, now more than ever.

23 of 25 people found this review helpful.  Was this review helpful to you?

Message Boards

Recent Posts
Any idea what happened to the director?? roadkillwabbit
Woman saws off foot Karen_vinter
Inseminoid 2? AlbinoAl
French trailer OO72
come on...this movie isn't scary moviethinker
Discuss Horror Planet (1981) on the IMDb message boards »

Contribute to This Page

Create a character page for: