Each year since 1990, the small German town of Wacken is transformed from a quaint storybook-like village to the site of the Wacken Open Air Festival -- the heavy metal festival annually attended by more than 70,000 raucous music fans. Directed by Sung Hyung Cho, this entertaining documentary explores the relationship between the wild Open Air faithful and the unassuming townsfolk who welcome them every year.