Blankman

Darryl (Damon Wayons) is a geeky inventor with a superhero fixation who lives with his grandmother. When his encouraging grandmother is shot by a mob boss who is trying to sway a mayoral election, Darryl decides to do something about crime in his fictional city of Metro, Illinois--so he dons special underwear and his grandmother's housecoat and turns himself into a superhero--sort of. He has no name and no special powers, but he's all for truth, justice and the American way! (official distributor synopsis)