Re-released in the late 1970s under a new title, "Cemetery Girls," on a double feature with Brides of Blood (1968), then re-titled "Grave Desires".
Like several other Spanish horror films of the period made under the Francisco Franco regime, this film was shot with different versions in mind for both the domestic and international markets. Nude scenes featuring the entire main female cast were replaced with either clothed or semi-nude scenes made for Spain, which means that different versions of it have been released over the years on home video. An unedited version of it did not turn up on U.S. VHS until Sinister Cinema found a U.S. print that was more complete than the tame version that had been previously released by Gorgon Video, and this unedited version was later released in a (terrible-looking) DVD version from Eclectic.
The 2016 Vinegar Syndrome DVD/Blu-ray combo release of the complete and unedited version of the film included an insert booklet with liner notes by longtime Paul Naschy enthusiast Mirek Lipinski of Latarnia who offered several details about the film, including a tantalizing mention of some perverse footage (up to 15 min.) that was removed from the final cut.
In an interview, Mirta Miller [xxxx] said she had fun getting to play a sexy monster, despite being cold while wandering around in lingerie most of the time.
A man is hacked in the head with an ax and is shown falling down the stairs to his death five times in slow motion during the film's opening credits. Some versions of the film edit out this scene.