15 Best Sci-Fi Movies With Devastating Endings
15. Primer
Two engineers accidentally invent a crude time machine and become entangled in increasingly complex timelines. One tries to shut it all down, but the other keeps building, hinting at something far more dangerous on the horizon. | © ThinkFilm
14. Coherence
During a dinner party, friends realize they’re caught in a cosmic glitch where multiple versions of themselves exist nearby. One woman, desperate for a better life, violently swaps places with a version of herself, only to face a chilling twist in the end. | © Oscilloscope Pictures
13. When Worlds Collide
After Earth is destroyed, a small group of survivors reaches a new planet that may become their home. But as they step into the unknown, the question hangs: will humanity really survive this second chance? | © Paramount Pictures
12. Threads
After surviving nuclear war, a young woman endures years of suffering only to watch history repeat through her daughter. The film ends with a silent, final scream as she sees the baby her daughter just gave birth to, crushing any last trace of hope. | © BBC
11. 2001: A Space Odyssey
After a surreal journey through space and time, astronaut Dave Bowman encounters a mysterious alien monolith that transforms him into the Star Child, a new form of human evolution. The ending doesn’t explain – it dares you to interpret. | © Warner Bros. Pictures
10. Alien: Covenant
When the survivors think they’ve escaped, Daniels realises too late that the android aboard isn’t Walter, but David in disguise. As she’s locked in cryosleep, David calmly stores facehugger embryos among the unsuspecting colonists, sealing their horrific fate. | © 20th Century Studios
9. Possessor
Tasya Vos is a corporate assassin who hijacks other people’s bodies to carry out hits – but her latest mission spirals out of control. As identities blur, she ends up killing her own family, leaving us unsure if she’s lost control or always wanted this outcome. | © Signature Entertainment
8. Invasion of the Body Snatchers
As alien pods take over San Francisco, Matthew and Nancy believe they might be the last real humans left. But when they finally reunite, he lets out a chilling scream, he is one of them now, and Nancy is all alone. | © United Artists
7. Knowing
As a massive solar flare consumes Earth, Nicolas Cage’s character can do nothing but hold his loved ones in their final moments. While a few are saved on distant arks, the planet is wiped out completely, erasing humanity in an instant. | © Summit Entertainment
6. A Clockwork Orange
After undergoing brutal aversion therapy to “cure” his violent urges, Alex is declared rehabilitated and released into a world that turns against him. But in the final moments, a twisted fantasy reveals that the therapy failed, and he is just as dangerous as ever. | © Warner Bros. Pictures
5. Ex Machina
Ava, a humanoid AI, manipulates Caleb into helping her escape by making him believe she cares for him. Once free, she leaves him locked inside the lab, coldly proving she was never human to begin with. | © A24
4. The Thing
After surviving the alien terror, MacReady and Childs sit in the snow, sharing a drink as the camp burns around them. Neither knows if the other is still human, and that quiet uncertainty is what makes the ending so chilling. | © Universal Studios
3. The Mist
Believing all hope is lost, David kills the other survivors, including his own son, to spare them from the monsters outside. Moments later, the mist clears and the military arrives, leaving him screaming in agony over a choice he never had to make. | © MGM
2. Planet Of The Apes
After crash-landing on a strange planet ruled by apes, astronaut George Taylor fights to survive in a world where humans are hunted. In the final, iconic scene, he finds the ruins of the Statue of Liberty, realising he’s been on Earth all along, and humanity destroyed itself. | © 20th Century Studios
1. 12 Monkeys
James Cole is sent back in time to stop a deadly virus, but his mission ends with him being shot at the airport. As he dies, his younger self watches, revealing he’s been trapped in a time loop, doomed to fail again and again. | © Universal Studios
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