The film discusses the traits and originators of some of metal's many subgenres, including the New Wave of British Heavy Metal, power metal, Nu metal, glam metal, thrash metal, black metal, and death metal. Dunn uses a family-tree-type flowchart to document some of the most popular metal subgenres. The film also explores various aspects of heavy metal culture.
Sam Dunn
Chris Adler
Tom Araya
Gavin Baddeley
Blasphemer
Randy Blythe
Alice Cooper
Pamela Des Barres
Bruce Dickinson
Ronnie James Dio
Malcolm Dome
George Fisher
Tony Iommi
Joey Jordison
Lemmy Kilmister
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