Movies Like X: The Unknown

If you liked X: The Unknown (1956), a horror and science fiction movie directed by Leslie Norman, here are 20 movies with a similar feel, based on TMDB's recommendations. Each one links to its cast, trailer and where it's streaming.

1
The Giant Behemoth (1959)
★ 5.8/10Also science fiction and horror
Marine atomic tests cause changes in the ocean's ecosystem resulting in dangerous blobs of radiation and the resurrection of a dormant dinosaur which threatens London.
2
Quatermass 2 (1957)
★ 6.4/10Also science fiction and horror
In England, a group of space scientists led by Bernard Quatermass, who have developed plans for the first Moon colony, learn that a secret, ostensibly government-run, complex of identical design has been built in a…
3
Them! (1954)
★ 6.8/10Also science fiction and horror
As a result of nuclear testing, gigantic, ferocious mutant ants appear in the American desert southwest, and a father-daughter team of entomologists join forces with the state police officer who first discovers their…
4
Underwater (2020)
★ 6.3/10Also horror and science fiction
After an earthquake destroys their underwater station, six researchers must navigate two miles along the dangerous, unknown depths of the ocean floor to make it to safety in a race against time.
5
The Blob (1988)
★ 6.9/10Also horror and science fiction
In Arborville, California, three high school students try to protect their hometown from a gelatinous alien life form that engulfs everything it touches.
6
The Blob (1958)
★ 6.2/10Also horror and science fiction
A drive-in favorite, this sci-fi classic follows teenagers Steve and his best girl, Jane, as they try to protect their hometown from a gelatinous alien life form that engulfs everything it touches. The first to…
7
The End of Oak Street (2026)
★ 7.1/10Also science fiction and mystery
After a mysterious cosmic event rips Oak Street from suburbia and transports their neighborhood to someplace unknown, the Platt family soon discovers that their very survival depends on them sticking together as they…
8
The Asphyx (1972)
★ 6/10Also horror and science fiction
Hugo is a brilliant turn-of-the-century scientist, loved and respected by his family and friends, admired by his colleagues. But he is a man quickly becoming obsessed with a curious and frightening question...What is…
9
The Car (1977)
★ 6.4/10Also horror and mystery
The Utah community of Santa Ynez is being terrorized by a mysterious black coupe that appears out of nowhere and begins running people down. After the car kills off the town sheriff, Captain Wade Parent is determined…
10
The Return of Doctor X (1939)
★ 6/10Also science fiction and horror
When news reporter Walter Garrett arrives at the hotel room of bombshell actress Angela Merrova to conduct an interview, he finds her dead from multiple stab wounds. He returns with the police to find the hotel empty…
11
The Meg (2018)
★ 6.2/10Also science fiction and horror
A deep sea submersible pilot revisits his past fears in the Mariana Trench, and accidentally unleashes the seventy foot ancestor of the Great White Shark believed to be extinct.
12
Island of Terror (1966)
★ 5.9/10Also horror and science fiction
When a small island community becomes overrun with creeping, blobbish, tentacled monsters that liquefy and digest the bones from living creatures, the community struggles to fight back.
13
Phase IV (1974)
★ 6.3/10Also horror and science fiction
Arizona ants mock the food chain on their way to a desert lab to get two scientists and a woman.
14
Cosmos (2019)
★ 6/10Also science fiction and mystery
Three astronomers accidentally intercept what they believe to be a signal from a distant alien civilization, but the truth is even more incredible than any of them could have imagined.
15
Return of the Fly (1959)
★ 6.1/10Also horror and science fiction
Fifteen years after his father's experiments with matter transmission fail, Philippe Delambre and his uncle François attempt to create a matter transmission device on their own. However, their experiments have…
16
The Creeping Flesh (1973)
★ 5.9/10Also horror and science fiction
A Victorian scientist returns to London with his paleontological bag-of-bones discovery from Papua New Guinea. Unfortunately, when exposed to water, flesh returns to the bones, unleashing a malevolent entity on the…
17
Twice-Told Tales (1963)
★ 6.2/10Also horror and science fiction
3 horror stories based on the writings of Nathaniel Hawthorne. In the 1st story titled "Dr. Heidegger's Experiment", Heidegger attempts to restore the youth of three elderly friends. In "Rappaccini's Daughter", a…
18
Twilight Zone: The Movie (1983)
★ 6.5/10Also horror and science fiction
An anthology film presenting remakes of three episodes from the "Twilight Zone" TV series—"Kick the Can", "It's a Good Life" and "Nightmare at 20,000 Feet"—and one original story, "Time Out."
19
Alien Abduction (2014)
★ 5.9/10Also horror and science fiction
A vacationing family encounters an alien threat in this pulse-pounding thriller based on the real-life Brown Mountain Lights phenomenon in North Carolina.
20
The Invasion (2007)
★ 6.1/10Also horror and mystery
Washington, D.C. psychologist Carol Bennell and her colleague Dr. Ben Driscoll are the only two people on Earth who are aware of an epidemic running rampant through the city. They discover an alien virus aboard a…