6. Robot Monster (1953)
Director: Phil Tucker
Stars: George Nader, Claudia Barrett, Selena Royle, John Mylong
See, filmmakers were making bad 3D movies as far back as the early 1950s. Presented in three dimensions for no good reason, the infamous 1953 junk-fest Robot Monster was made without a shred of panache, resulting in hokey dialogue, laughable acting, and not a second of suspense whenever the titular alien attacks.
Really, Robot Monster would be entirely forgettable if it wasn't for Ro-Man's costume design, which is supposed make us believe that intergalactic killing machines look like gorillas wearing fishbowl helmets with antennas.