This is a thoughtful science fiction/horror movie from the 1960s that doesn't insult the intelligence of the viewers. Instead of relying on CGI to enthrall a clueless audience, this movie relies on something rather novel – a real story. Filmed on a budget, this Hammer Film's special effects are good enough to advance the story. Some IMDb reviewers have criticized the film for its "corny" special effects or its "ridiculous" story. They simply don't appreciate the movie's effects in their context. Further, I would disagree that the story is ridiculous. The story unfolds as the characters and viewers discover the secret in Hobbs End. If you don't know what the movie is about, you will enjoy this bit of discovery. Instead of so many contemporary films where the viewer is simply told what happens, as if he or she is slack-jawed imbecile, in Five Million Years to Earth the viewer is part of the discovery process. Finally, the sense of horror builds from a vague sense of unease to a real sense of loathing and fear. I've seen this movie at least a half dozen times and continue to enjoy it as much as the first time.