Actor Arjun Rampal is grateful to superstar Shah Rukh Khan for choosing him to play the villain's role in his dream project "RA.One" slated for a Diwali release.

"The day I heard the script of the movie, I instantly wanted to do the film. Shah Rukh has worked for over three years on this dream project and I am very glad he considered me for the role of Ra.One!" Arjun told friend, actress Preity Zinta on her chat show "Up, Close and Personal with PZ".

The actor, who won a best supporting actor National award for his performance in "Rock On!!", says he had to work hard for the superhero flick.

"We (Shah Rukh and I) would make up early morning and go running for miles up the hills and even in the lakes!"

Shah Rukh plays G.One in the movie, which also features Kareena Kapoor.