Does anyone know what film this is?

I can't remember the title and it's bugging me, it's quite an old film and a sequel came out a couple of years ago. A group of people go to another planet and there are these kinda like spider robots and cyborgs that kill people. I know in the second one the main woman is the daughter of the hero guy from the first film and she ends up pregnant with one of the robots and they're on the spaceship back to earth. I think it begins with S...