Where Ridley Scott's Alien was a creeping horror, for the sequel, director James Cameron swapped genres, delivering an all-guns-blazing action movie. That's not to say that it's unsophisticated; Cameron was inspired by America's experience in the Vietnam War in depicting how the gung-ho Space Marines are undone by a technologically-inferior enemy.
Heroine Ripley's character was fleshed out too, with the blue-collar worker of the first film recast as a surrogate mother to xenomorph survivor Newt – in Cameron's director's cut, he added further layers with the revelation that after 57 years in stasis, she missed her daughter's entire life.









It may be set in outer space, but Alfonso Cuarón’s thriller is remarkably contained; grounded, even. There are no flying saucers or little green men here, just a worryingly feasible disaster in orbit that leaves astronaut Ryan Stone stranded miles above the Earth. It’s heavy on spectacle, but for much of the film, the only person on screen is Sandra Bullock – giving a career-best performance as Dr Stone.