Anand aka Bruce Lee, is a college graduate who hates the idea of 9-5 jobs. He studies martial arts with a group of similarly jobless friends. Attempting to recruit new students to pay tuition fees and save their school, he gets involved in a brawl and falls for Shakthi, the daughter of DCP Gaurav. In Chennai, A series of heists are happening across India, which has left dozens dead and countless amounts of money stolen. The police believe that a new robbery is about to take place. Anand's grandfather advises him to make Shakthi see him as a Hero. Anand borrows and wears a superhero costume, who introduce introduce himself as Mugamoodi to Shakthi and tries to impress the children with his skills and accidentally ends up in the middle of a police chase. He helps the police capture one of the bandits. However, the gang shoots the captured member dead when police are transferring him and kill an Inspector, who was involved in the arrest.

The news that Mugamoodi captured one of the suspects, which police could not catch them in many months, spreads across the city and makes Shakthi begin to like Mugamoodi. Gaurav finds a match between a fingerprint from the crime scene and one from police records. Anand tries to visit Shakthi again, unmasked to reveal his identity and confess his love to her. When he arrives, he encounters a gang member, who shoots Gaurav, Anand tries to seize him, But the gunman escapes after the gun is seized by Anand and the family believe Anand shot Gaurav, so he is being chased by the police and on the run. The gang kills Viji, Anand's friend, who went with him to visit Shakthi. Anand is again seen by police alone with a dead body and is naturally thought responsible for the killing. Anand's grandfather and brother create a batman-styled-superhero costume with a blue bodysuit, a black belt with the letter M on it, a black superhero mask, black leather boots and gloves.

Gaurav survives and the gang decides to kill him and his family in the hospital. Anand (masked himself as Mugamoodi) saves them by defeating the gang with his kung fu skills and takes Gaurav's police documents containing the latest findings of the case, including the fingerprint match, because he wants to avenge Viji's death on his own. To his shock, The police findings in the documents are against Sifu Chandru, who is his martial arts teacher. Chandru reveals that he is not connected to those cases and reveals that Anguchamy aka Dragon is behind the crimes. They learned kung-fu in the same school 22 years ago. Meanwhile, Dragon also somehow learns that Mugamoodi is Anand. His gang raids Chandru's school to kill Anand, but they kill Chandru when he is nowhere to be seen. The gang seizes a port and kidnaps 30 children, along with three adults including Shakthi, as hostages to blackmail the police.

They demand Mugamoodi drive a van of gold alone and the police arrange a ship and guarantees their safety across the Indian border, The gang threaten to kill the hostages if refused. Mugamoodi agrees to drive the gold, where a fight ensues between him and Dragon. During the fight, Dragon takes off Mugamoodi's mask and reveals his identity to Shakthi. He also confesses that Anand did not shoot Gaurav, but his brother Anthony did. With the help of his grandfather and friends that had him sneaked into the port, Anand kills some key members of the gang. A fight ensues between Anand and Dragon, Dragon hangs from a ladder, holding on with a hammer. Anand tries to pull Dragon, but Dragon instead falls to his death in the sea. Anand manages to release all the hostages and Shakthi kisses him and tells him to continue his service as Mugamoodi.