"I Drink Your Blood" was marketed and released as a double feature with Del Tenney's 1964 film "Zombies", which had been acquired by producer Jerry Gross and renamed "I Eat Your Skin".The double-feature was marketed a year after the trial and conviction of Charles Manson and his accomplices, Manson having been an inspiration for the character of Horace Bones, with producer Gross wanting to cash in on the public's recent fascination with the case.