Alien

Easily one of the best and most iconic horror movies. The acting was really good, the characters were not just some random dumbasses, they planned ways of stopping the xenomorph, although none were successful. I really liked how throughout the movie the lights were flickering, it really shows that the ship is in disarray following the birth of the alien. Also, the xenomorph costume and puppets? were really good, especially for 1979. Probably the space horror movie and also one of the best(probably)