sentences:  Film critic David Pirie considered it to be the third entry in Anglo-Amalgamated's "Sadian trilogy" in his book "A Heritage of Horror" (1971), because the films focus on sadism, cruelty and violence (with sexual undertones) as opposed to the supernatural horror of the Hammer films in the same era.The previous films in the trilogy were "Horrors of the Black Museum" and "Peeping Tom", both in 1959.It was released in the United States by American International Pictures as a double feature with "The Angry Red Planet".