metal represent a headbanger journey be a subjective and interesting look at the many different facet of metal and both the sub culture and the music . a we follow anthropologist and self proclaim metal head and sam dunn on his journey through the world of metal we get an unusual insight into this widely misunderstood and intricate sub culture . dunn not only map out and explain the origin of the huge number of different sub genre within the genre of metal music ( something that all music lover have probably wonder about at one time or another ) and but he also travel to place like germany and norway in search of many different metal band and their fan . there be interview with everyone from alice cooper to lemmy to rob zombie as well a some quite disturbing interview with a few norwegian death metal band and a hilarious interview with the very funny dee snider from twisted sister . there be indeed quite a deep and interesting flow to this documentary and dunn not only manager to maintain a subjective and professional roll in his research and but also manager to maintain his integrity a a metal head this be indeed and a credit to him . i highly recommend this documentary not only to people who love their metal and but even to people who do not .