It's almost inconceivable that 40 years have passed since what's been called the greatest sci-fi action film of all time (and not just by us) assaulted theaters with the juiced-up sequel to Ridley Scott's 1979 classic, "Alien." Director James Cameron's propulsive vision for a gung-ho military-style movie would call upon Stan Winston Studio's elite creature effects crew from 1984's "The Terminator" — a team that would later work on "Predator," "T…