Toting his camera to the forests of Norway, the streets of Birmingham, Ala., and the dark side of Los Angeles's Sunset Strip, filmmaker Sam Dunn explores heavy metal culture from the inside, shedding light on extremes associated with the art form. Dunn explores the origins of metal subgenres such as power, glam, thrash, black and death. The authentic soundtrack includes music from Iron Maiden, Black Sabbath, Slayer, Motorhead, Rush and Slipknot.