So next to the Predator outfit, I definitely think the Alien outfit comes next as the best alien monster ever conceived by movie directors. It's absolutely gruesome and scary looking.
Sigourney Weaver did a spectacular job fighting off these Aliens in the movies. Of course it's just fake acting, but the action sequences were great. Almost as if the Aliens did exist and Ripley was a real person. That's what makes a movie great, making it have a true feeling.
This movie has gone down in history as the greatest Alien movie ever made.