- When the titular antagonist of an action game takes on physical form, it's only the game's less powerful protagonist who can save his creator's family.
- Following his son Prateek's suggestion, Shekhar designs an action game where the antagonist is more powerful than the protagonist. The player has to fight in the first two levels to reach the third and final one where whoever fires the bullet first wins. The game is well-received on its opening night, but things go wrong when Prateek stops playing and quits the game in between, only to invite the wrath of Ra.One, the game's villain, who uses an advanced technology to take on physical form. He is out to destroy Prateek, something only G.One, the game's protagonist, can prevent from happening.—Prashast Singh
- Jenny Nayar (Shahana Goswami), an employee of the UK-based company Barron Industries, introduces a new technology at a conference. The technology allows objects from the digital world to enter the real world through wireless transmissions. Shekhar Subramanium (Shahrukh Khan), a game designer who also works for the company and has delivered a spate of commercial failures, is given a final chance to devise a video game which will actually succeed. In order to impress his skeptical son Prateek (Armaan Verma), and upon the request of his wife Sonia (Kareena Kapoor), Subramanium uses his son's idea that the antagonist should be more powerful than the protagonist.
Shekhar's work colleague Akashi (Tom Wu) provides the movements of the game characters, while Jenny designs the game's program. She uses Shekhar's face as a model for that of the game's protagonist (G.One), while the antagonist (Ra.One) is faceless. Each player possesses a H.A.R.T, a special device which gives the characters their powers. The game, titled "Ra.One," has three levels. Either of the players can be killed only in the third level with a special gun that holds only one bullet, with the condition that the player has his H.A.R.T attached. When tests are conducted, Akashi notices peculiarities in the game but ignores them.
When the game is finally launched, it receives a standing ovation and Prateek is so enamored that he insists on playing it immediately. He logs in under the alias "Lucifer" and proceeds to the second level, but is interrupted by Akashi. Ra.One, unable to end his turn with Lucifer and angry that a player has proceeded so far, becomes determined that Lucifer will die.
Ra.One uses the technology introduced at the beginning of the film to enter the real world, a process which causes the mainframe to malfunction. Akashi informs Shekhar of the problem; the latter partially understands the situation. Fearful of his son's life, he rushes home. Meanwhile, Ra.One kills Akashi and assumes his form; he then goes to find Lucifer, and meets Shekhar in the process.
In an attempt to save his son, Shekhar claims that he is Lucifer. However, Ra.One scans Shekhar's I.D. and kills him for lying. After Shekhar's funeral, Sonia tells Prateek that the family will return to India. Later, Prateek notices digital patterns left on the scene of his father's death, and realizes that Ra.One has come to life. He and Jenny attempt to bring G.One to life in a manner similar to Ra.One. Ra.One chases the family on their way to the airport, but G.One enters the real world through Jenny's computer and causes a gas explosion which temporarily destroys Ra.One. G.One takes Ra.One's H.A.R.T. and accompanies the family to India, after Sonia realizes that she cannot leave him. G.One promises to Sonia that he will protect Prateek from harm. Subsequently, Ra.One returns to life, takes the form of a billboard model (Arjun Rampal), and goes after G.One and Prateek.
At Prateek's birthday party, Ra.One hypnotizes Sonia, assumes her form and kidnaps Prateek. Ra.One then instructs G.One to give him his H.A.R.T. back, and sends the real Sonia in a Mumbai Suburban Railway train. The train crashes into the Chatrapati Shivaji Terminus and destroys it, but G.One saves Sonia just before the crash. He returns to save Prateek, and consequently resumes the game with Prateek controlling him. After a series of fights, both the characters reach the third level.
With little power left, G.One and Prateek trick Ra.One into shooting G.One without his H.A.R.T. attached. Since only one bullet was available, Ra.One is left helpless; furious, he creates ten copies of himself. Prateek, unable to differentiate the real Ra.One, asks G.One to quote Shekhar: ("If you join the forces of evil, its shadows shall always follow you"). The pair realize that only one of the ten Ra.Ones has a shadow: the original one. G.One shoots and destroys him, absorbs Ra.One's remains and finally disappears. Several months later, Prateek and Sonia return to London, where the former finally manages to restore G.One to the real world.
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