
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.
Cast

Sam Dunn
Self

Chris Adler
Self

Tom Araya
Self
Gavin Baddeley
Self
Blasphemer
Self

Randy Blythe
Self

Alice Cooper
Self
Pamela Des Barres
Self

Bruce Dickinson
Self

Ronnie James Dio
Self

Malcolm Dome
Self

George Fisher
Self

Tony Iommi
Self

Joey Jordison
Self

Lemmy Kilmister
Self

Kerry King
Self

Geddy Lee
Self

Tom Morello
Self
Jørn Stubberud
Self

Vince Neil
Self

Doro Pesch
Self
Dee Snider
Self

Corey Taylor
Self

Alex Webster
Self

Rob Zombie
Self

Fritz Hollings
Self (archive footage)
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