"Dr. Cyclops" was Albert Dekker's signature part, and virtually all of his obituaries mentioned the film.
Luana Walters was originally slated for the role of Mary Robinson.
Allen Fox as "Cab Driver" is in studio records/casting call lists for that role, but he did not appear or was not identifiable in the movie.
One of over 700 Paramount Productions, filmed between 1929 and 1949, which were sold to MCA/Universal in 1958 for television distribution, and have been owned and controlled by Universal ever since.
The first science fiction film to be shot in three-color Technicolor.