The story of a 30-year old scientist who pursues to study a distinctive culture, one he has been ever a part: the culture of heavy metal. He has a trip to discover the reason why this music is loved by a lot of people. He realizes that metals' obsession with controversial issues: sexuality, religion, violence and death.
A documentary that preaches to the converted if ever there was one, but Dunn's enthusiasm for the subject and the range of pretension and humour of his interviewees makes for fun viewing.
Interviews with metal practitioners such as Tony Iommi, Alice Cooper, Rob Zombie and Dee Snider, journalists and academic types paint a compelling portrait of a vibrant society of outsiders.
The metal scene emerges throughout the documentary as the recruitment center of an army of misfits, where the outcasts of the world can seek each other out based on their love of the angsty, eardrum-destroying tunes their parents warned them about.
