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The film ends with the following written biblical quote: "'Verily, I say unto you...except ye become as little children, ye shall not enter into the kingdom of heaven.' (St. Matthew, Ch. 18, v. 3)." The Space Children was released on a double bill by Paramount with another William Alland production, The Colossus of New York. The Space Children was the final science fiction film directed by Jack Arnold, who had previously helmed such Universal releases as 1953's It Came from Outer Space and 1957's The Incredible Shrinking Man (see entries above).
According to modern sources, the name of Tom Filer's unpublished story was "The Egg" and it differed greatly from the Bernard Schoenfeld screenplay. In Filer's story, Kathy, a young polio victim, finds an alien "egg" after a storm. Mysteriously told to protect the egg for ten hours, Kathy battles against her parents, neighbors and local authorities, who seek to destroy the ever-growing creature. The egg then absorbs Kathy, only to suddenly vanish and leave the young girl cured of her lameness. Modern sources state that the alien creature in The Space Children was built out of plastic by Ivyl Burks, the head of Paramount's prop department. In its largest state, the extraterrestrial prop weighed more than 1,000 pounds, measured five feet wide by ten feet long and contain over $3,000 worth of neon lights.
The Space Children marked the motion picture debut of actor Ty Hungerford, who soon changed his name to Ty Hardin and gained fame on the television series Bronco. Although Hardin mostly worked in television, he continued to appear films through the 1990s.