The original Alien and its sequel Aliens are true classics of the genre. Different movies in almost every way, but equally superior film making. Alien 3 and Alien Resurrection are sorry excuses for sequels. They're classic examples of Hollywood greed. Bad stories wrapped in excellent SFX don't make memorable movies. Alien and Aliens should be at or near the top of your "Must Have" sci-fi/horror/action DVD list. Aliens 3 and Alien Resurrection...well, something has to be at the bottom o' the heap.