Ra.One is a 2011 Indian Hindi-language superhero film directed by Anubhav Sinha and produced by Gauri Khan under Red Chillies Entertainment. The film stars Shah Rukh Khan in a dual role and Arjun Rampal as the titular antagonist, with Kareena Kapoor, Armaan Verma, Shahana Goswami, Tom Wu, Dalip Tahil and Satish Shah in supporting roles. The name is inspired by hindu mythological character Ravana. The film, Ra.One, a video game antagonist, escapes from the virtual world and arrives in the real world to hunt down Lucifer, the ID of Ra.One's creator Shekhar Subramaniam's son Prateek, as he had defeated Ra.One in a game. Shekhar gets killed by Ra.One, but Prateek resurrects G.One, the video game protagonist and Shekhar's lookalike, to defeat Ra.One and protect him and his family.
Description from Wikipedia