Terminator was science fiction thriller.
The original Predator was science fiction meets military.
The second Predator was science fiction meets cop.
Alien was Science fiction - horror
To be horror genre, it must be horrible.
People being outmatched by a superdude/bug/monster/whatever doesn't define a genre in itself. Its how its written that defines the genre.
A monster that eats space ships and threatens your planet is Space Opera. An unseen monster that eats people's brains is horror. Although if thats on another planet you need a space ship to go to, its scifi again with a horror twist. (Thinking Starship troopers. The brain eating scene was horror for me, but the movie was scifi.) (Then again, arachnophobia was my idea of the worst horror movie possible, but that wasnt even horror genre.)
The original Predator was science fiction meets military.
The second Predator was science fiction meets cop.
Alien was Science fiction - horror
To be horror genre, it must be horrible.
People being outmatched by a superdude/bug/monster/whatever doesn't define a genre in itself. Its how its written that defines the genre.
A monster that eats space ships and threatens your planet is Space Opera. An unseen monster that eats people's brains is horror. Although if thats on another planet you need a space ship to go to, its scifi again with a horror twist. (Thinking Starship troopers. The brain eating scene was horror for me, but the movie was scifi.) (Then again, arachnophobia was my idea of the worst horror movie possible, but that wasnt even horror genre.)