Mumbai, March 31 (ANI): In a grand event held in Mumbai Bollywood superstar Amitabh Bachchan launched the hindi trailer of Rajnikant's upcoming film Kochadaiiyaan. The event saw the presence of many B-Town stars who came in to cheer up Rajnikant. Speaking on the occasion Mr. Bachchan said that it was his pleasure to be a part of the event; While Souther superstar Rajnikant thanked him for accepting the invitation. Kochadaiiyaan is an upcoming Tamil 3D computer-animated period film directed by Rajnikants daughter Soundarya R. Ashwin and is expected to release on 1st May.