Reliving the Unforgettable Tour in Big B's Den. Amitabh Bachchan will host a special 3 part series based on The Unforgettable Tour to the US. The guests will be Bollywood stars Preity Zinta, Ash Rai Bachchan and his own son Abhishek, who will share stories of their time on the tour. The first  episode will air on September 19th at 10 pm Indian Standard Time on NDTV Imagine.