Tollywood Mega Star Chiranjeevi has been coming with the period drama 'Syeraa Narasimha Reddy' directed by Surender Reddy and produced by his actor son Ram Charan. Addressing at the teaser launch of the film 'Syeraa Narasimha Reddy', Chiranjeevi has called Amitabh Bachchan as Indian Mega Star. Chiranjeevi has revealed how he is impressed and overwhelmed by the generosity of Big B to work with him in the film. 'There is only one megastar and that is Amitabh Bachchan. In the film, he is playing the character of my guru', Chiranjeevi said.