Science fiction horror explores what happens when humanity pushes too far into the unknown. Unlike traditional horror rooted in ghosts or folklore, sci-fi horror often emerges from technology, artificial intelligence, deep space, biotechnology, surveillance, and scientific ambition. These stories ask unsettling questions about identity, control, and survival, forcing characters to confront futures where reality itself begins to feel unstable. From the claustrophobic terror of Alien and Event Horizon to the psychological unease of Black Mirror and Annihilation, sci-fi horror combines atmospheric tension with the fear that humanity may no longer fully understand the systems it has created. This collection of 70 Sci-Fi Horror Writing Prompts explores abandoned colonies, corrupted AI systems, quarantined megacities, hostile organisms, deep-sea facilities, collapsing simulations, and retrofuturist dystopias. Designed as a complete creative toolkit, the post includes plot hooks, opening lines, title ideas, setting prompts, character concepts, cinematic visual inspiration, and deeper speculative writing exercises. Whether you are planning a larger science fiction novel, experimenting with cosmic horror, or simply looking for dark futuristic story ideas, these prompts encourage atmospheric storytelling shaped by isolation, paranoia, and the terrifying possibilities of the future.