
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
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

The Whole Gritty City
The Whole Gritty City

Utopia Ltd.
Utopia Ltd.

Joyce at 34
Joyce at 34

The Remarkable Life of Ibelin
The Remarkable Life of Ibelin

It Came From Aquarius Records
It Came From Aquarius Records

Super Hero Festival: KAMEN RIDER×SUPER SENTAI LIVE & SHOW 2025
Super Hero Festival: KAMEN RIDER×SUPER SENTAI LIVE & SHOW 2025

To Singapore, with Love
To Singapore, with Love

War of Words: Battle Rap in the UK
War of Words: Battle Rap in the UK

Step
Step

Bring Me the Horizon: Live at the Royal Albert Hall
Bring Me the Horizon: Live at the Royal Albert Hall

Ending Is the Beginning: The Mitch Lucker Memorial Show
Ending Is the Beginning: The Mitch Lucker Memorial Show

Approaching the Elephant
Approaching the Elephant