A 1964 moon landing discovers they were not the first men to arrive there. Turns out there was an 1899 expedition to the moon. Upon investigating, they find the only living member (Edward Judd) of that voyage. He tells the tale of how he and his fiancée (Martha Hyer) accompanied brilliant scientist Professor Cavor (Lionel Jeffries) to the moon through use of a special gravity-defying substance called Cavorite. Once there, they encounter an insectoid race of creatures known as Selenites. It's a fun old-fashioned sci-fi adventure. Beautiful sets, great Ray Harryhausen special effects and a script by venerable Nigel Kneale, adapted from the story by H.G. Wells. Most of Wells' social commentary is absent from the film. Some of it is still present, particularly in one of the film's best scenes -- Cavor's talk with the leader of the Selenites, the Grand Lunar.