Best movies like The Intruder Within

Similar in 82%

The Alien Factor (1978)

Plot Summary:

A spaceship containing specimens for an intergalactic zoo crashes on Earth near a small back woods town. The specimens escape, and soon town folk are turning up mutilated. Very low budget feature was the first for Baltimore filmmaker Don Dohler.

Similar in 84%

Xtro 3: Watch the Skies (1995)

Plot Summary:

Marines on a deserted island are ordered to disfuse bombs, but then an alien creature terrorizes them.

Similar in 90%

The Aliens Are Coming (1980)

Plot Summary:

An alien mother ship hovering in Earth's atmosphere is the base for an attempted alien invasion of Earth.

Similar in 87%

Dead Space (1991)

Plot Summary:

Phaebon had been thought to be a safe and controlled research facility until a distress signal calls for Commander Kreiger and his robot Tinpan. Together, they try to save the planet from a spreading virus and an odd and growing cocoon. Remake of "Forbidden World" (1982).

Similar in 80%

The Being (1981)

Plot Summary:

Toxic waste dumping in a small Idaho town turns a young boy into horrible mutant monster. The town's police chief and a government scientist team up to stop the monster, which is quickly killing off the town's citizenry.

Similar in 76%

The Navy vs. the Night Monsters (1966)

Plot Summary:

US Navy battles monsters unearthed from the frozen arctic.

Similar in 76%

Unseen Evil 2 (2004)

Plot Summary:

After a series of brutal, unexplained murders in a remote forest, a rogue military unit is recruited to hunt for whoever - or whatever - has rendered the attacks. In order to carry out the investigation, they need the help of the only survivor, Kate. But first they have to get her released from the mental institution she's been confined to since the horrific attack. Written.

Similar in 88%

Metamorphosis: The Alien Factor (1990)

Plot Summary:

A virus from outer space transforms a bio-researcher into a blood thirsty monster. But chief, Dr.Vialini doesn't like the cops and public to be involved in this secret experiment. But he becomes lunch very soon.

Similar in 75%

The Milpitas Monster (1976)

Plot Summary:

A monster created from a garbage dump; local pollution terrorizes a town.

Similar in 76%

Varan the Unbelievable (1962)

Plot Summary:

In an effort to find an economic means of purifying salt water, a joint U.S.-Japanese military command is set up on an isolated Japanese island where an unusual salt water lake is situated. However, their purifying experiments arouse the prehistoric monster Obaki from hibernation at the lake's bottom, and it proceeds to attack Japan.

Similar in 78%

Star Crystal (1986)

Plot Summary:

Crew members aboard a space ship encounter an alien life form intent on killing them.

Similar in 90%

The Terror Within II (1990)

Plot Summary:

In a world gone mad, the last human colony struggles to survive underground, beneath a land of nightmarish mutants who seek to destroy them. But when the mutant breaks inside humanity's final stronghold, the battle for survival pits the human colonists against their deadly invaders miles below the earth's surface.

Similar in 88%

Track of the Moon Beast (1976)

Plot Summary:

Professor "Johnny Longbow" Salina, a man who really knows his stews, introduces Paul Carlson to the practical-joking Kathy Nolan. Paul and Kathy seem to hit it off rather well but, during a meteor storm, a meteorite fragment strikes Paul, burying itself deep in his skull, which has the unpleasant side-effect of causing Paul to mutate into a giant reptilian monster at night and go on murderous rampages. It turns out that this sort of thing has happened before, when Professor Salina rediscovers ancient Native American paintings detailing a similar event many centuries ago. Kathy, however, still loves Paul, and tries to save him.

Similar in 79%

Critters 4 (1992)

Plot Summary:

Just before bounty hunter Charile triggers his gun to destroy the last two Critter-eggs, he gets a message that it would be illegal to extinguish the race from the galaxy. He's sent a transporter where he puts the eggs - unfortunately the transporter takes him with it and then gets lost in space.

Similar in 75%

It Lives Again (1978)

Plot Summary:

The monster child returns - but now there are three!.

Similar in 84%

Harbinger Down (2015)

Plot Summary:

A group of grad students have booked passage on the fishing trawler Harbinger to study the effects of global warming on a pod of Orcas in the Bering Sea. When the ship's crew dredges up a recently thawed piece of old Soviet space wreckage, things get downright deadly. It seems that the Russians experimented with tardigrades, tiny resilient animals able to withstand the extremes of space radiation. The creatures survived, but not without mutation. Now the crew is exposed to aggressively mutating organisms. And after being locked in ice for 3 decades, the creatures aren't about to give up the warmth of human companionship.

Similar in 85%

Rejuvenator (1988)

Plot Summary:

A rich actress who has gotten too old for leading roles employs a scientist who is working on a formula for eternal youth. The formula involves withdrawing certain fluids from the human brain. She takes the serum, but its unforeseen side effects turn her into a murderous monster.

Similar in 83%

Forbidden World (1982)

Plot Summary:

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

Similar in 85%

Creature (1985)

Plot Summary:

A crew of scientists arrives on a far, cold planet to examine archaic artifacts of unknown origin. They discover that their German enemies already have a ship there. When they seek their help after a failed landing, they only find the Germans’ bodies, obviously slaughtered by one of the archaic creatures, awoken to new life. Now the alien is after them.

Similar in 80%

The Deadly Spawn (1983)

Plot Summary:

Two campers in the New Jersey woods have their outdoor fun interrupted by the arrival of a meteorite crashing nearby. They go to investigate the crater, but are suddenly attacked and devoured by alien parasites who have hitched a ride to Earth. After finishing off the campers, the hungry space monsters head for a nearby town, where they make their domain in the basement of an old house soon begin polishing off one hapless inhabitant after another. Four young teenagers, plus one pre-teen boy, try to find a way to stop the angry space monsters before they reproduce and literally eat humanity.

Similar in 83%

Body Snatchers (1993)

Plot Summary:

When Environmental Protection Agency inspector Steve Malone travels to a remote military base in order to check for toxic materials, he brings his family along for the ride. After arriving at the base, his teenage daughter Marti befriends Jean Platt, daughter of the base's commander, General Platt. When people at the base begin acting strangely, Marti becomes convinced that they are slowly being replaced by plant-like aliens.