Bruised and beaten, arm in a sling, neck in a brace, Arthur Poppington (Woody Harrelson) sits in front of court-appointed psychologist Ellen Park (Sandra Oh). After making her swear to secrecy, Poppington begins to tell the story of his secret life as "Defendor" yes, that's an "OR" spelling is not one of his super powers. By day, Poppington directs traffic around road construction sites, but at night he dons a pair of black tights, a black jersey with a crude "D" duct-taped to his chest, and trawls the streets as his alter ago. As Defendor, Poppington engages in what he believes is a super heroic fight against crime in an attempt to fulfill his unrealized dream of capturing his archrival, Captain Industry, a gun trafficking crime lord who Poppington mistakenly believes is responsible for the death of his mother.
Defendor's problems with the law begin with his intervention in a trick gone bad. When coming to the aid of Katerina Debrofkowitz (Kat Dennings), an underage prostitute, Defendor tangles with her pimp, Chuck Dooney (Elias Koteas), a crooked undercover cop. By doing so, Defendor bumbles his way into a criminal underworld, and the stage is set for a showdown with Captain Industry.
DEFENDOR is the ultimate underdog story about the unlikeliest of super heroes. While he may be deficient in super powers, he has a surplus of heart and sometimes that's all you need to make a difference.