The film begins with a team of United Nations astronauts planning an upcoming moon mission. The astronauts are both confused and intrigued by a man (Edward Judd) who claims he, his fiancee and a scientist journeyed to the moon 65 years ago and were attacked by "Selenites," grotesque, human-like ant forms that live in immense crystal caverns. Now it's up to the U.N. team to attempt a lunar landing that could be more horrifying than ever believed possible. Directed by Nathan Juran (Attack of the 50-Foot Woman), FIRST MEN IN THE MOON also stars Martha Hyer and Lionel Jeffries.