Bollywood superstar Shah Rukh Khan celebrates 51st birthday today. In his journey of more than two decades in the Hindi Film Industry, the actor has given many memorable performances and has also done different films. One such film that was out of his comfort zone was Ra.One. The sci-fi flick saw Shah Rukh Khan playing a superhero for the first time in his career. The film got a mixed response but it made the cash ringing at the box office. Ra.One was directed by Anubhav Sinha. After Ra.One, the filmmaker will don the director’s hat for his upcoming directorial venture Tum Bin 2. It seems that Anubhav Sinha is on a spree of making sequels. The director wishes to make sequels of his films Dus (2005) and Ra.One (2011).