From high school through graduate studies, Sam Dunn has a passion for screaming guitars, blinding pyrotechnics and blown-out eardrums. In this acclaimed doco, Dunn is joined by co-directors Scot McFadyen and Jessica Joy Wise to set forth on a mission to glean the riotous rhyme and reason of metal. Journeying through America and Europe, following tours and attending open-air metal fests, the filmmaker’s document people's opinions about the scene. Fans and metal gods alike weigh in with appearance by Rush's Geddy Lee, Ronnie James Dio, Alice Cooper, Motörhead’s Lemmy, musician and horror icon Rob Zombie, Motley Crue's Vince Neil, Black Sabbath's Tony Iommi and Iron Maiden's Bruce Dickinson.