Fans love filling in the gaps with their fan theories.

When you think of Sigourney Weaver, you might picture her exploring psychedelic alien worlds in "Avatar" or transforming into ...

Interstellar, Alien, and Back to the Future are all among the all-time greatest sci-fi movies that deliver everything you ...

From Alien to The Thing, these are the ten most perfect science fiction horror movies of all time.

Ridley Scott's iconic sci-fi horror movie "Alien" was released in the United States on May 25, 1979, meaning it turns 47 this year.