Ra.One (Hindi: रा.वन; full: Random Access–Version 1.0) is a 2011 Indian science fiction superhero film, written and directed by Anubhav Sinha. The film, which features Shahrukh Khan in dual roles, as a game developer and his superhero look-alike G.One, also stars Kareena Kapoor, Armaan Verma and Arjun Rampal as the titular game villain Ra.One. Shahana Goswami, Dalip Tahil and Chinese-American actor Tom Wu appear in supporting roles, along with Rajinikanth, Sanjay Duttand Priyanka Chopra making guest appearances. It is jointly produced by Eros International and Khan's production company, Red Chillies Entertainment and was originally scheduled to release on 3 June 2011. However, due to extensive post-production work involving special effects and 3D conversion, its release was postponed to 26 October 2011.
Development of the project commenced in 2004 when Sinha wrote a three-page short story based on a commercial he had seen. Upon finalizing the story, pre-production work began after the release of Khan's Om Shanti Om in 2007 with principal photography commencing in March 2009. In July 2011, it was announced that the entire film would be converted into 3D. With an estimated budget of around 
150 crore (US$30.42 million),Ra.One is India's second most expensive film to date, after Enthiran Prior to its international release of 26 October 2011, the film had multiple premieres in Dubai, London and Toronto during the period of October 24 - 26. The film released across 5,000 screens worldwide in 2D and around 600 screens in 3D along with its dubbed versions in Tamil, Telugu and German making it the largest Indian cinematic release in the world. Upon release, Ra.One received a mixed critical reception in India and a mostly positive critical reception overseas. The film went on to break multiple box-office records, including highest Diwali day collections, highest single-day collections and highest three-day collections
150 crore (US$30.42 million),Ra.One is India's second most expensive film to date, after Enthiran Prior to its international release of 26 October 2011, the film had multiple premieres in Dubai, London and Toronto during the period of October 24 - 26. The film released across 5,000 screens worldwide in 2D and around 600 screens in 3D along with its dubbed versions in Tamil, Telugu and German making it the largest Indian cinematic release in the world. Upon release, Ra.One received a mixed critical reception in India and a mostly positive critical reception overseas. The film went on to break multiple box-office records, including highest Diwali day collections, highest single-day collections and highest three-day collections| Ra.One | |
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 Theatrical release poster | |
| Directed by | Anubhav Sinha |
| Produced by | Gauri Khan |
| Written by | Anubhav Sinha |
| Screenplay by | Anubhav Sinha Kanika Dhillon Mushtaq Sheikh David Benullo |
| Story by | Anubhav Sinha |
| Starring | Shahrukh Khan Kareena Kapoor Arjun Rampal Armaan Verma Shahana Goswami Tom Wu |
| Music by | Vishal-Shekhar |
| Cinematography | Nicola Pecorini V. Manikandan |
| Editing by | Sanjay Sharma Martin Walsh |
| Distributed by | Eros International Ltd. Red Chillies Entertainment |
| Release date(s) | October 24, 2011 (Dubai premiere) October 25, 2011 (London premiere) October 26, 2011(Toronto premiere and worldwide release) |
| Running time | 163 minutes |
| Country | India |
| Language | Hindi |
| Budget | 150 crore (US$30.42 million) |
| Box office | 173 crore (US$35.08 million)(five days worldwide gross) |