In 1965, American International Pictures distributed this film on a double bill with Planet of the Vampires. (Planet of the Vampires was dubbed in English and retitled "Planet of the Vampires".)
The train station at which Stephen Reinhart (Nick Adams) disembarks is called Arkham. Arkham was a fictional town created by H.P. Lovecraft.
This was the first directing job for veteran art director/production designer Daniel Haller , which began filming February 15 1965.