Defendor (2009)

Defendor is a Canadian superhero/comedy-drama film written and directed by Peter Stebbings, and starring Woody Harrelson, Kat Dennings, Elias Koteas and Sandra Oh. The story tells of a regular man who adopts the persona of a superhero named Defendor on a quest to find his arch enemy.

Genre: Comedy | Crime | Drama
Tagline: An unexpected hero will rise.
Plot: A comedy centered around three characters: an everyday guy who comes to believe he's a superhero, his psychiatrist, and the teenager he befriends.

http://www.imdb.com/title/tt1303828/
http://en.wikipedia.org/wiki/Defendor