aramis erak
Legend
I've only used 2 for it... ALIENS Adventure Game, and ALIEN.With (yet another) new Alien flick on the horizon (please be good!) I was thinking about TTRPGs which do the Alien franchise well.
Obviously, there's the official Alien TTRPG from Free League (2nd Edition coming soon).
There's Mothership, which I hear also does it very well--I get to play that in a couple of weeks, I hope!
Of course any sci-fi RPG can do Alien, but which ones do it the best?
AAG does not do it well.
ALIEN does it just about perfect.
Classic Traveller has an article about the "Reticulan Parasite"... but using Traveller for it is very Meh, IMO. I've friends who tried it. Neither they nor their players were enthusiastic about it.
Not being a fan of OSR designs in general, and found the first edition of MOthership indecipherable, haven't looked past that.
Hero System can do it, and well, but there are other reasons I've not bothered.