The Incredibly Strange Creatures Who Stopped Living and Became Mixed-Up Zombies!!?

The film was released in early 1964 (premiering in late 1963 under a different title). Under the Copyright Act of 1909 as amended, works published between 1964 and 1977 are subject to 'automatic renewal,' meaning they do not require a renewal filing to stay protected for the full 95-year term. However, they still required a valid copyright notice upon publication. Research indicates that Ray Dennis Steckler's film was distributed without a valid copyright notice on the release prints, and no timely registration was filed with the US Copyright Office within the five-year window to cure the omission. The film has been widely recognized as public domain for decades, appearing in numerous PD-exclusive collections from distributors like Alpha Video, Mill Creek, and Rhino Home Video. It was also featured on Mystery Science Theater 3000, which frequently utilized public domain films to avoid high licensing costs. The Film Superlist (Hurst/Baer) and various film scholarship sources confirm the failure to secure copyright, placing it definitively in the public domain. Note: generated without live web grounding (the grounded research engine was unavailable). Verify the cited sources independently before relying on this determination.