Wasily oh it’s a completely different movie. Though not technically a director’s cut, as Fincher had almost nothing to do with it. It’s called an Assembly Cut, and it apparently resembles Fincher’s original vision for the movie, before the studio wanted the movie to be shorter. I’m a bit fuzzy on that partical part of the Alien-lore, but it does explain why the xenomorph got loose again after they managed to capture it. Still not a great one, but maybe a good one when compared to the theatrical cut. I’ve naturally got the Blu Ray box-set which has alternative cuts to all 4 movies. 😀