A run-down spacecraft. Interesting characters. Awesome Sigourney Weaver. Plus one hell of an ominous, drooling, seemingly indestructible H. R. Giger-designed monster! Whose threatening and disturbingly sexualized presence, by the way, is notably lessened when it is shown in full figure at the end.
Claustrophobic, shadowy, tense – and with some corporate capitalist shadiness typical of the seventies. This hugely influential franchise-starter became director Ridley Scott’s breakthrough as well as Weaver’s, and stays in my very slim book of really good sf/horror movies.