Metal Evolution: Extreme Metal is the definitive documentary episode exploring the musical history of metal's most underground sub-genre. Featuring candid interviews, never-before-seen archival material, rare music clips and travel footage from around the world, the episode will bring you closer to the personalities and historic locations of Extreme Metal than ever before. This episode will give testament to metal's most misunderstood sub-genre, thrilling both die-hard metalheads and the general music lovers alike.

Metal Evolution is a 2011 documentary series directed by anthropologist and film-maker Sam Dunn and director, producer and music supervisor Scot McFadyen about heavy metal subgenres, with new episodes airing every Friday at 10pm EST on MuchMore and Saturday at 10pm EST on VH1 Classic. Its origins come from Dunn's first documentary Metal: A Headbanger's Journey, which included the acclaimed "Heavy Metal Family Tree."

In GLOBAL METAL, directors Scot McFadyen and Sam Dunn set out to discover how the West's most maligned musical genre - heavy metal - has impacted the world's cultures beyond Europe and North America. The film follows metal fan and anthropologist Sam Dunn on a whirlwind journey through Asia, South America and the Middle East as he explores the underbelly of the world's emerging extreme music scenes; from Indonesian death metal to Chinese black metal to Iranian thrash metal. GLOBAL METAL reveals a worldwide community of metalheads who aren't just absorbing metal from the West - they're transforming it - creating a new form of cultural expression in societies dominated by conflict, corruption and mass-consumerism.

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.