Memory: The Origins of Alien includes exclusive behind-the-scenes footage, storyboards and more from Alien creators Dan O'Bannon and H.R. Giger.

While the chestburster scene in director Ridley Scott's 1979 sci-fi horror classic Alienstill haunts me, it's because of Alien's originality and complex creatures that I grew up loving horror films. Now fans like me can continue to celebrate the movie's 40th anniversary with a new documentary called Memory: The Origins of Alien. 

The first trailer for the documentary shows exclusive behind-the-scenes footage that gives fans the untold origin story behind the movie.