Arthur (Woody Harrison Woody Harrelson) is an unskilled construction worker with a slow brain and a single-minded personality, but he is addicted to superhero comics and personal heroism, fantasizing that he is a superhero like Superman and Batman, who can have another identity to punish evil and promote good at night. So he made ridiculous wardrobe equipment with eye shadow and duct tape, and his weapons were glass beads and orange juice with no lethality, and he was often beaten black and blue by thugs when he shot. After a beating, a young prostitute Catherine (Kate Dailings Kat Dennings) helps him, and the two gradually fall in love with each other, and Arthur has to take the gun Catherine gave him and hit the stone to challenge the city's drug lord.