11 Most Terrifying Sci-Fi Movie Monsters
1. Demonic Force - Event Horizon
Possibly the single scariest entry on this list is one you can never hope to beat, because it's not a corporeal being.
The very essence of Hell itself, the demonic force that inhabits the titular spacecraft drove its crew to madness within seconds, leading to mass orgy of violence and self-mutilation that ended in all of their violent deaths. The moment a rescue team steps foot indoors, the force begins toying with them, probing their innermost thoughts and traumas and creating apparitions based on them to drive them insane.
Its objective is very simple, to return from whence it came so it can spread it's evil throughout the known universe. Even after our protagonists seemingly destroy it for good, it only lies in stasis and infects their minds, preparing to do the very same to an unknowing rescue team.