14: 'Destination Moon' - 1950 - Plot: Straightforward and forward-looking story of mankind's first expedition to the Moon.

15: 'The Flying Saucer' - 1950 - Plot: UFO sightings are linked to a secret Soviet aircraft. The first film to focus on UFOs and to use the term "flying saucer."

16: 'Rocket Ship X-M' - 1950 - Plot: An early space mission to the Moon goes off course and ends up on Mars.

17: 'The Man from Planet X' - 1951 - Plot: A visitor from outer space uses a ray gun to control a scientist, his daughter, and others in a remote Scottish village.

18: 'When Worlds Collide' - 1951 - Plot: When scientists discover a rogue planet on a collision course with Earth, a plan is developed to save a handful of people to repopulate a new Earth.

19: 'Red Planet Mars' - 1952 - Plot: In the midst of the Cold War, earthlings get messages from the cosmos -- or perhaps from God?

20: 'The Beast from 20,000 Fathoms' - 1953 -
Plot: A nuclear blast awakens a dinosaur, who leaves his Arctic stomping ground and heads to Manhattan to terrorize the natives. Based on a story by Ray Bradbury. Features stop-motion animation by Ray Harryhausen.

21: 'Invaders from Mars' - 1953 - Plot: A boy sees a flying saucer land in the desert, but no one believes him until his friends, family, and neighbors start acting strangely.

22: 'It Came from Outer Space' - 1953 - Plot: Alien "xenomorphs" crash-land in the Arizona desert and masguerade as humans to avoid detection. Originally released in 3D.

23: 'War of the Worlds' - 1953 - Plot: A group of scientists and military troops try to fight off an all-out Martian invasion of Earth. Based on the novel by H.G. Wells.

24: 'Conquest of Space' - 1954 - Plot: The U.S. military seeks to conquer new territory - Mars. Features excellent special effects by legendary George Pal.

25: '20,000 Leagues Under the Sea' - 1954 -
Plot: A scientist and a sailor get involved with Captain Nemo, a power-hungry mariner who has a futuristic submarine. Based on the novel by Jules Verne.

26: 'It Came from Beneath the Seas' - 1955 -
Plot: Atomic tests in the Pacific rouse a giant octopus that attacks San Francisco. Features stop-motion animation by Ray Harryhausen.

27: 'This Island Earth' - 1955 - Plot: Scientists are lured into using their talents to help save an alien civilization.

28: 'Earth vs the Flying Saucers' - 1956 - Plot: Aliens from a dying planet attempt to conquer and colonize Earth. Features Ray Harryhausen's special effects.

29: 'Forbidden Planet' - 1956 - Plot: Survivors of a spaceship crash meet the enigmatic Dr. Morbius, his beautiful daughter, their robot assistant Robby, and the dangerous creature of the Id. Based on Shakespeare's play "Tempest."

yes, there are many more