The Hellfest is 75000 festival-goers of 50 nationalities gathered during 3 days in Clisson, a medieval city of the Pays de Loire. Metal, punk, hardcore, small group for connoisseurs and mega world stars, they are all gathered at Hellfest. Thomas VDB, the inevitable troublemaker of music on France 4 embarks on the adventure of Hellfest. He will meet artists and festival-goers, while parsemant his course of fundamental questions, which he has the secret.