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
as Self
Chris Adler
as Self
Tom Araya
as Self
Gavin Baddeley
as Self
Blasphemer
as Self
Randy Blythe
as Self
Alice Cooper
as Self
Pamela Des Barres
as Self
Bruce Dickinson
as Self
Ronnie James Dio
as Self
Malcolm Dome
as Self
George Fisher
as Self
