Defendor is a 2009 Canadian-American superhero film written and directed by Peter Stebbings in his directorial debut. It stars Woody Harrelson as Arthur Poppington, a regular man who adopts a superhero persona named Defendor, with Elias Koteas, Michael Kelly, Sandra Oh and Kat Dennings in supporting roles.

Dr. Park, a psychiatrist, is interviewing Arthur Poppington, a vigilante known as "Defendor", about his assault of a dry cleaning business owner. The story flashes back to Arthur's encounter with Dooney, a corrupt detective that Arthur believes is in the employ of his nemesis, "Captain Industry", who Arthur blames for his mother leaving him as a child and later dying from a drug overdose.

Arthur is arrested for assaulting Dooney, but Fairbanks, the police captain in charge, sees Arthur as harmless and connects with him because their grandfathers both served in World War I. After Arthur is released, he returns to his day job at a government construction depot. His life is solitary, but after another confrontation with Dooney, he meets Angel, a prostitute who was smoking crack with Dooney. After he is brutally beaten by Dooney's friends, she helps him recover and informs him that Captain Industry's real name is Radovan Kristic. Arthur lets her move in with him, and enlists her help in apprehending Kristic.

Arthur's boss and close friend Paul becomes concerned for Arthur after he finds that Arthur is living at the construction depot with Angel. Paul tries to help, offering Arthur the opportunity to come and live with him, which Arthur rejects. That night, Arthur ventures out to spy on "Captain Industry" and Dooney, and overhears them discussing an illegal shipment. Arthur reveals himself and after a short chase, he is beaten and shot. Angel finds the injured Arthur and contacts Paul who helps get Arthur to the hospital.

While Arthur is in surgery, Paul tells Angel to leave Arthur alone. Angel visits an unconscious Arthur and reveals that she ran away from home because her father was physically abusing her. After she leaves, Arthur opens his eyes, having heard everything. Angered at how Angel was treated, Arthur walks down to the mall and beats up Angel's father, the laundromat owner from the beginning of the story.

After Dr. Park absorbs all this, she admits she's not sure if his actions were wrong. She tells the judge that Arthur is mentally underdeveloped (revealed to be fetal alcohol syndrome) and persuades him not to be too harsh. The judge agrees on the condition Arthur doesn't become Defendor again. A reporter approaches Paul and convinces him to let her run a story about Arthur as Defendor, and he agrees. People are inspired by Defendor's attempts to save lives and fight crime.

Angel becomes desperate for a fix and returns to Dooney. Dooney, recognizing her friendship with Defendor and worried about how much Arthur knows about the shipment, takes her hostage and threatens Arthur to stay quiet. Arthur misinterprets Dooney's demand as never speaking again, and a silent Arthur decides to once again becomes Defendor and save Angel.

Angel manages to escape from Dooney by shooting him in the testicles and reunites with Arthur, but Angel is upset when he reveals he still plans to go after Kristic. She tells him Captain Industry isn't real, she just named Kristic because she wanted revenge on him. In a flashback it is revealed that Arthur's grandfather, in order to spare him pain as a child, metaphorically blamed his mother's death on the "captains of industry". Due to his developmental disability, Arthur has been chasing a delusion his entire life.