All four films in the alien saga in ridley scotts alien 1979 the crew of a deep space mining vessel come across something decidedly unpleasant on a mysterious planet after leaving the desolate planet they realise that something has survived and is on their ship in james camerons sequel aliens 1986 sole survivor ripley sigourney weaver and a team of space marines return to the aliens home planet to investigate some mysterious happenings but soon a new deadly game of cat and