Lamb Of God's Randy Blythe and Morbid Angel's David Vincent also make cameos in the film, based on the adventures of a band called Witches' Lips, whose music has been written and performed by ex Judas Priest frontman Tim 'Ripper' Owens and Phil Anselmo collaborator Marzi Montazeri.

Creators Joshua Allan Vargas and Jvstin Whitney - who spent 11 years on the project - recently explained: "A hair metal band, while struggling to find its own identity, decides to record its first full-length album in a notorious cemetery.