The legendary career of musician Frank Sidebottom (a.k.a. comedian Chris Sievey) is put on display in the first trailer for Frank. Although you can't tell just from watching the footage, Michael Fassbender stars as Frank Sidebottom, who became notorious for always wearing a paper mache head, years before Daft Punk gained notoriety for never revealing their faces. This dark comedy is loosely based on the memoirs written by Jon Ronson (Domhnall Gleeson), who joins Frank's eclectic band. Maggie Gyllenhaal and Scoot McNairy co-star in director Lenny Abrahamson's bizarre comedy, which doesn't have a domestic release date set at this time, but will debut in U.K. theaters May 9.