Movies like Spawn of the Slithis (1978)
The best movies like Spawn of the Slithis (1978) are Underwater (2020), Them! (1954) and X: The Unknown (1956). If Spawn of the Slithis hooked you with its horror and science fiction, these 30 similar films are what to watch next, and every pick says why it matches.
Quick picks
- Highest ratedDeep Water (2026)7.4/10 from 732 votes
- NewestThe End of Oak Street (2026)Released 2026
Underwater (2020)
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.
Why it matches: Recommended by TMDB viewers · both horror & science fiction
Popcorn FlickMovies like thisThem! (1954)
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 existence, an FBI agent and, eventually, the US Army to eradicate the menace, before it spreads across the continent — and the world.
Why it matches: Recommended by TMDB viewers · both science fiction & horror
Popcorn FlickMovies like thisX: The Unknown (1956)
Army radiation experiments awaken a subterranean monster from a fissure that feeds on energy and proceeds to terrorise a remote Scottish village. An American research scientist at a nearby nuclear plant joins with a British investigator to discover why the victims were radioactively burned and why, shortly thereafter, a series of radiation-related incidents are occurring in an ever-growing straight line away from the fissure.
Why it matches: Recommended by TMDB viewers · both horror & science fiction
Popcorn FlickMovies like thisIsland of Terror (1966)
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.
Why it matches: Recommended by TMDB viewers · both horror & science fiction
SnoozefestMovies like thisThe Giant Behemoth (1959)
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.
Why it matches: Recommended by TMDB viewers · both science fiction & horror
SnoozefestMovies like thisThe Asphyx (1972)
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 the mysterious apparition found in the photographs of his dying subjects?
Why it matches: Recommended by TMDB viewers · both horror & science fiction
Popcorn FlickMovies like thisThe Meg (2018)
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.
Why it matches: Recommended by TMDB viewers · both science fiction & horror
Popcorn FlickMovies like thisThe Blob (1958)
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 discover the substance and live to tell about it, Steve and Jane witness the blob destroying an elderly man, then it growing to a terrifying size. But no one else has seen the goo, and policeman Dave refuses to believe the kids without proof.
Why it matches: Recommended by TMDB viewers · both horror & science fiction
Popcorn FlickMovies like thisThe Blob (1988)
In Arborville, California, three high school students try to protect their hometown from a gelatinous alien life form that engulfs everything it touches.
Why it matches: Recommended by TMDB viewers · both horror & science fiction
Popcorn FlickMovies like thisMeg 2: The Trench (2023)
An exploratory dive into the deepest depths of the ocean of a daring research team spirals into chaos when a malevolent mining operation threatens their mission and forces them into a high-stakes battle for survival.
Why it matches: Recommended by TMDB viewers · both science fiction & horror
Popcorn FlickMovies like thisPhase IV (1974)
Arizona ants mock the food chain on their way to a desert lab to get two scientists and a woman.
Why it matches: Recommended by TMDB viewers · both horror & science fiction
Popcorn FlickMovies like thisGodzilla: King of the Monsters (2019)
Follows the heroic efforts of the crypto-zoological agency Monarch as its members face off against a battery of god-sized monsters, including the mighty Godzilla, who collides with Mothra, Rodan, and his ultimate nemesis, the three-headed King Ghidorah. When these ancient super-species, thought to be mere myths, rise again, they all vie for supremacy, leaving humanity's very existence hanging in the balance.
Why it matches: Recommended by TMDB viewers · both science fiction
Popcorn FlickMovies like this65 (2023)
65 million years ago, the only 2 survivors of a spaceship from Somaris that crash-landed on Earth, must fend off dinosaurs to reach the escape vessel in time before an imminent asteroid strike threatens to destroy the planet.
Why it matches: Recommended by TMDB viewers · both science fiction
SnoozefestMovies like thisRampage (2018)
Primatologist Davis Okoye shares an unshakable bond with George, the extraordinarily intelligent, silverback gorilla who has been in his care since birth. But a rogue genetic experiment gone awry mutates this gentle ape into a raging creature of enormous size. To make matters worse, it’s soon discovered there are other similarly altered animals. As these newly created alpha predators tear across North America, destroying everything in their path, Okoye teams with a discredited genetic engineer to secure an antidote, fighting his way through an ever-changing battlefield, not only to halt a global catastrophe but to save the fearsome creature that was once his friend.
Why it matches: Recommended by TMDB viewers · both science fiction
Popcorn FlickMovies like thisDeep Water (2026)
A group of international passengers on a flight from Los Angeles to Shanghai is forced to make an emergency landing in shark-infested waters. The terrified group is forced to work together and overcome their differences if they hope to escape their sinking plane and the frenzy of sharks drawn to the wreckage.
Why it matches: Recommended by TMDB viewers · both horror
Worth the HypeMovies like thisThe End of Oak Street (2026)
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 navigate their now unrecognizable surroundings.
Why it matches: Recommended by TMDB viewers · both science fiction
Worth the HypeMovies like thisVenom (2018)
Investigative journalist Eddie Brock attempts a comeback following a scandal, but accidentally becomes the host of Venom, a violent, super powerful alien symbiote. Soon, he must rely on his newfound powers to protect the world from a shadowy organization looking for a symbiote of their own.
Why it matches: Recommended by TMDB viewers · both science fiction
Popcorn FlickMovies like thisI Am Mother (2019)
A teenage girl is raised underground by a robot "Mother", designed to repopulate the earth following an extinction event. But their unique bond is threatened when an inexplicable stranger arrives with alarming news.
Why it matches: Recommended by TMDB viewers · both science fiction
Popcorn FlickMovies like thisSignal One (2026)
A computer scientist is invited by a tech billionaire to join his private facility on a Caribbean island to investigate extraterrestrial matter on Earth. When they make contact beyond our world, chaos erupts as we’re left to wonder: do they come in peace?
Why it matches: Recommended by TMDB viewers · both science fiction
Popcorn FlickMovies like thisPacific Rim (2013)
Using massive piloted robots to combat the alien threat, Earth's survivors take the fight to the invading alien force lurking in the depths of the Pacific Ocean. Nearly defenseless in the face of the relentless enemy, the forces of mankind have no choice but to turn to two unlikely heroes who now stand as Earth's final hope against the mounting apocalypse.
Why it matches: Recommended by TMDB viewers · both science fiction
Worth the HypeMovies like thisFrankenstein (1984)
A scientist who is obsessed with creating life finally does it, with tragic results.
Why it matches: Similar story and style · both horror & science fiction
Frankenstein (1973)
A scientist obsessed with creating life steals body parts to put together his "creation." Released as a feature on video, this was originally shown in two installments on TV as part of the Wide World of Entertainment series.
Why it matches: Similar story and style · both horror & science fiction
Dracula vs. Frankenstein (1971)
Judith Fontaine is looking for her sister Joanie, who has disappeared into the hippie community of Venice, California. It turns out that Joanie has become fallen victim to Groton, an axe-wielding homicidal maniac under the employ of Dr. Durea, the last living descendant of the Frankenstein family and is now both running a house of horrors on the beach's boardwalk and performing experiments on Groton's victims in his basement laboratory.
Why it matches: Similar story and style · both horror & science fiction
SnoozefestMovies like thisTerror of Frankenstein (1977)
Victor Frankenstein's search for the secret of life leads to the creation of a monster that consumes his life and family.
Why it matches: Similar story and style · both horror & science fiction
The Projected Man (1966)
Matter-transmitter sabotage leaves a British scientist (Bryant Halliday) disfigured and full of amps.
Why it matches: Similar story and style · both horror & science fiction
Frankenstein: The True Story (1974)
Victor Frankenstein witnesses his creation turn uncontrollable after he's duped by his associate, Dr. Polidori.
Why it matches: Similar story and style · both horror & science fiction
Lady Frankenstein (1971)
When Dr. Frankenstein is killed by a monster he created, his daughter and his lab assistant continue his experiments.
Why it matches: Similar story and style · both horror & science fiction
SnoozefestMovies like thisFrankenstein Meets the Wolf Man (1943)
After being resurrected by grave robbers, Larry Talbot searches for Dr. Frankenstein in the hopes of being cured of his lycanthropy. The mad scientist may turn out to be dead, but his monster is just waiting to be found…
Why it matches: Similar story and style · both horror & science fiction
Popcorn FlickMovies like thisThe Horror of Frankenstein (1970)
Brilliant but arrogant scientist Victor Frankenstein builds a man from spare body parts, only for the monster to come alive and wreak havoc.
Why it matches: Similar story and style · both horror & science fiction
SnoozefestMovies like thisThe War of the Gargantuas (1966)
Gaira, a humanoid sea beast spawned from the discarded cells of Frankenstein's monster, attacks the shores of Tokyo. While the Japanese military prepares to take action, Gaira's Gargantua brother, Sanda, descends from the mountains to defend his kin. A battle between good and evil ensues, leaving brothers divided and a city in ruins.
Why it matches: Similar story and style · both horror & science fiction
Popcorn FlickMovies like this
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Frequently asked questions
What are the best movies like Spawn of the Slithis?
The closest matches to Spawn of the Slithis are Underwater (2020), Them! (1954) and X: The Unknown (1956). Below are 27 more, each with the reason it matches.
What should I watch after Spawn of the Slithis?
Start with Underwater (2020), the closest match to Spawn of the Slithis.
What is the highest-rated movie like Spawn of the Slithis?
Deep Water (2026), rated 7.4/10 by 732 TMDB users.
What is the newest movie like Spawn of the Slithis?
The End of Oak Street (2026) is the most recent release on this list.
Are there English movies like Spawn of the Slithis?
Yes: Underwater (2020), Them! (1954) and X: The Unknown (1956).
How are movies similar to Spawn of the Slithis chosen?
First come films that Trakt’s viewers watch alongside Spawn of the Slithis, then TMDB’s recommendations and films it rates as similar in story and genre. Each pick says which signal put it there.