Some of the most terrifying movies ever made aren’t necessarily classified as horror. Science fiction has spent decades finding new ways to frighten audiences, often without relying on masked killers or supernatural monsters. After all, few things are more unsettling than realizing reality might not be what it seems, particularly when science offers no reassuring explanation.
While the scariest sci-fi horror movies tend to feature hostile aliens or grotesque creatures, psychological sci-fi thrillers can be equally disturbing. Their greatest weapon is uncertainty. A dinner party becomes a nightmare, a scientific breakthrough turns catastrophic, or a seemingly innocent discovery exposes something humanity was never meant to understand. The resulting anxiety can be considerably harder to shake than a conventional jump scare.
Many of these movies slipped through the cracks during their original releases, only to develop devoted followings among genre enthusiasts. Others earned critical acclaim without reaching mainstream audiences, despite offering some of the most disturbing stories in modern cinema. Their relative obscurity makes them particularly rewarding discoveries for viewers who think they’ve exhausted the usual Halloween recommendations.
Of course, the boundary between science fiction, thrillers, and horror has always been somewhat flexible. Some of these selections contain unmistakable horror elements, while others achieve their frightening effects through ideas alone. Like the non-horror movies that are surprisingly terrifying, these 10 underrated sci-fi thrillers demonstrate that a genuinely disturbing premise can be more frightening than anything lurking in the shadows.
Coherence (2013)
James Ward Byrkit’s Coherence proves that a science fiction thriller doesn’t need an enormous budget or elaborate special effects to become genuinely terrifying. The movie follows eight friends gathering for a dinner party on the night a comet passes close to Earth. When the neighborhood experiences a sudden power outage, the guests begin noticing strange inconsistencies that suggest something far more alarming than an electrical failure.
As the evening progresses, familiar relationships become increasingly unstable, and the characters struggle to determine whom they can trust. Byrkit transforms an ordinary suburban home into an environment filled with paranoia, using the possibility of alternate realities to challenge the audience’s understanding of identity. The mind-bending science fiction mystery grows more disturbing with each revelation, eventually reaching a conclusion that invites immediate reconsideration of everything that came before.
Dark City (1998)
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Alex Proyas’ Dark City is one of the most visually distinctive science fiction thrillers of the 1990s, yet it remains overshadowed by The Matrix, which arrived the following year. Rufus Sewell plays John Murdoch, a man who awakens in a bathtub with no memory of his identity, only to discover that he’s wanted for a series of brutal murders. Worse, the mysterious city surrounding him appears to operate according to impossible rules.
The film’s perpetually dark streets and sinister inhabitants create an atmosphere reminiscent of a waking nightmare. Its central mystery gradually reveals implications far more disturbing than Murdoch’s suspected crimes. Featuring Jennifer Connelly, Kiefer Sutherland, and William Hurt, Dark City combines film noir with existential science fiction, questioning whether memories, identities, or even human experiences can be trusted.
Timecrimes (2007)
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Time travel rarely ends well in science fiction, and Nacho Vigalondo’s Spanish-language thriller Timecrimes takes that warning to uncomfortable extremes. Karra Elejalde plays Héctor, an ordinary man whose curiosity leads him into the woods surrounding his home. After encountering a mysterious bandaged figure, he stumbles upon an experimental time machine and inadvertently becomes trapped in an increasingly complicated sequence of events.
Rather than using elaborate visual effects, Timecrimes builds its suspense around the consequences of seemingly minor decisions. Every attempt to correct the situation creates additional complications, gradually transforming an ordinary afternoon into a psychological nightmare. The film’s ingenious construction rewards close attention, but its most frightening quality is the growing realization that Héctor may be powerless to escape the consequences of his actions.
Europa Report (2013)
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Space exploration sounds considerably less appealing after watching Europa Report. Directed by Sebastián Cordero, this found-footage science fiction thriller follows a privately funded expedition to Europa, one of Jupiter’s moons, where scientists hope to discover evidence of extraterrestrial life. The crew’s extraordinary journey gradually becomes a desperate fight for survival as equipment failures and unexpected discoveries threaten the mission.
Unlike most space-set thrillers, Europa Report grounds its story in relatively plausible scientific procedures. Much of the action unfolds through surveillance cameras and recorded transmissions, lending the increasingly dangerous situation an uncomfortable realism. Its commitment to scientific credibility makes the unfolding terror particularly effective. There are few places more frightening than deep space when something goes wrong.
The Endless (2017)
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Brothers Justin Benson and Aaron Moorhead directed and starred in The Endless, an independent science fiction thriller that turns a seemingly peaceful religious community into the setting for an existential nightmare. The filmmakers play brothers who escaped a mysterious group years earlier, only to return after receiving a strange videotape. Their reunion with former acquaintances quickly reveals that something profoundly unnatural is happening around the isolated settlement.
Much of the film’s effectiveness comes from its refusal to immediately explain the increasingly bizarre phenomena. Unusual events initially seem harmless before suggesting a reality in which time and human existence operate according to horrifying rules. The cosmic horror beneath The Endless becomes increasingly apparent as the brothers uncover the truth. Its implications are chilling, particularly for anyone frightened by the prospect of being trapped without an escape.
Upgrade (2018)
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Artificial intelligence has inspired plenty of unsettling science fiction, but Leigh Whannell’s Upgrade makes the loss of human autonomy particularly horrifying. Logan Marshall-Green plays Grey Trace, a mechanic left paralyzed following a violent attack that kills his wife. An experimental computer chip called STEM restores his mobility, giving him extraordinary physical abilities and the opportunity to track down those responsible.
Unfortunately, Grey soon discovers that sharing his body with an intelligent machine comes with consequences. The film’s brutal action sequences are impressive, especially the unnatural precision with which STEM controls Grey’s movements. However, its most disturbing moments concern the gradual erosion of personal agency. Long before the final revelation, Upgrade makes the prospect of surrendering control to technology seem like a terrifyingly bad idea.
Under The Skin (2013)
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Scarlett Johansson delivers one of her most unconventional performances in Jonathan Glazer’s Under the Skin, playing a mysterious woman who travels through Scotland searching for unsuspecting men. Her character is actually an extraterrestrial being disguised as a human, although the movie offers few straightforward explanations for her behavior or the disturbing events that follow.
Glazer creates an atmosphere of extraordinary discomfort through sparse dialogue and haunting visual imagery. Ordinary encounters become increasingly sinister as the audience gradually understands the nature of the protagonist’s mission. The film also reverses conventional alien-invasion expectations by portraying humanity through the perspective of an unfamiliar predator. Under the Skin remains one of Johansson’s most underappreciated science fiction movies, largely because its unsettling atmosphere refuses to provide easy answers.
Aniara (2018)
If the thought of being stranded in space sounds frightening, Aniara takes that concept to its bleakest possible conclusion. This Swedish science fiction drama follows passengers aboard an enormous spacecraft transporting people from an environmentally devastated Earth to a new life on Mars. When an accident sends the vessel hopelessly off course, its inhabitants must confront the possibility that they will never reach their destination.
What follows is an extraordinarily unsettling examination of human behavior under circumstances of unimaginable isolation. The ship’s passengers initially search for practical solutions and emotional distractions, but their increasingly desperate attempts to preserve normality eventually reveal the devastating psychological consequences of their situation. Aniara contains relatively little conventional horror, yet its depiction of cosmic indifference is more distressing than many movies filled with monsters.
Possessor (2020)
Brandon Cronenberg’s Possessor offers a particularly disturbing vision of technology’s potential to destroy individual identity. Andrea Riseborough stars as Tasya Vos, an assassin employed by a secretive organization that uses experimental brain-implant technology to take control of unsuspecting people. By inhabiting another person’s body, Vos can carry out murders without being physically present at the crime scene.
The premise becomes increasingly nightmarish when Vos begins losing her grip on her own identity during an especially dangerous assignment. Cronenberg combines graphic violence with psychological terror, using disturbing imagery to explore the consequences of separating human consciousness from the body. Although the movie clearly shares DNA with his father David Cronenberg’s work, Possessor has developed a formidable reputation of its own. Its deeply uncomfortable ending makes this an especially difficult movie to forget.
Event Horizon (1997)
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Few science fiction movies have developed a cult following quite like Paul W. S. Anderson’s Event Horizon. Laurence Fishburne leads a rescue mission investigating a spacecraft that mysteriously disappeared years earlier before suddenly reappearing near Neptune. Sam Neill plays the scientist responsible for designing the ship’s experimental propulsion system, which may have opened a gateway to somewhere humanity should never have visited.
Originally dismissed by many critics, Event Horizon has since earned recognition as a cult favorite. Its combination of psychological terror and grotesque imagery transforms a conventional rescue mission into something considerably more sinister. The movie certainly crosses into outright horror, but its science fiction premise makes the central mystery especially disturbing.
Event Horizon
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