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.
| Pemain: | Alice Cooper, Blasphemer, Bruce Dickinson, Chris Adler, Gavin Baddeley, Malcolm Dome, Pamela Des Barres, Randy Blythe, Ronnie James Dio, Sam Dunn, Tom Araya |
| Direksi: | Jessica Joy Wise, Sam Dunn, Scot McFadyen |
| Negara: | Canada |
| Rilis: | |
| Bahasa: | English |
