"I was Catholic when I put the album on. Midway through, I became a full-blown Satanist": Watch the first episode of the eagerly-awaited series Tony Iommi - The Godfather of Heavy Metal, starring Rob Halford, Zakk Wylde, Brian May, Tom Morello and more

Tony Iommi relaxing at home in 1995.

The eagerly-awaited first episode of Tony Iommi: The Godfather of Heavy Metal, is now available online.

The series, which tells the story of the Black Sabbath guitarist via archive footage and present-day interviews, with an emphasis on his role as one of the originators of heavy metal. It's praise Iommi was initially reluctant to embrace.