This movie, especially the explosion of the laboratory, influenced James Whale while making the Frnakenstein movies.

At the time this movie was filmed, the leading lady, Alice Terry was married to director Rex Ingram. They were wed four years earlier, while collaborating on The Prisoner of Zenda (1922).

The surrealism of the hypnosis sequence is heightened by a level of male nudity rarely, if ever, presented in films of this era.

This film was lost for many years.

Paul Wegener was largely unknown to American cinema-goers when this film was being made.