Jackie Chan was approached for a role in the film which was finally played by Tom Wu.
Shown on 3,100 screens.
The film's crew consisted of more than 5,000 members from India, Italy and the US, and was pieced together by more than 1,000 people, working in shifts, in around 15 studios across the world.
Amitabh Bachchan did the voice-over for the game intro in the film.
Verma, who plays Khan's son in the film, had to learn the Brazilian martial arts dance Capoeira in preparation for his role.
To reports of similarities with other films Khan responded with "I got inspired from a lot of superhero movies but the movie is original. In fact, Ra.One will be the first superhero-based movie in the world in which the superhero lives in a family."
Dara Bubamara sampled the song "Chhamak Chhalo" for her song "Balkanac".
Child actor Armaan Verma was required to go through several audition processes until he was finally selected to play the role of Prateek.
While shooting for the film in Mumbai, Russian President Dmitry Medvedev visited Yash Raj Studios, to watch Khan at work.
Features 3,500 special effects shots.
R&B singer Akon recorded two songs for the film.
The idea of making Ra.One originated while he was watching a commercial on TV six years ago. Sinha said, "The commercial dealt with two kids controlling a human with a remote. It was fascinating, and the visual stayed with me for some time." Sinha wrote a three-page short story based on the commercial, which he felt was good enough to be made into a film.
Days before its release, script-writer Yash Patnaik claimed that the film resembled a concept that he had developed several years back.
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