Query: 1930s science fiction horror films
Relevant documents:
Frankenstein (1931 film)
Bride of Frankenstein
The Invisible Man (1933 film)
The Invisible Ray (1936 film)
Maniac (1934 film)
The Man They Could Not Hang
Island of Lost Souls (1932 film)
The Vampire Bat
The Return of Doctor X
The Man Who Changed His Mind
Alraune (1930 film)