"Up at 7 a.m. to reach for a dub for 'Krissh 3'... Rakesh Roshan, father to Hrithik and the director and producer of eminence, asked me to do a voiceover for his film... I agreed and that was done," the 70-year-old posted on his blog srbachchan.tumblr.com in the wee hours of Saturday morning.
Hrithik plays a superhero in this third film of the franchise which began with 'Koi Mil Gaya' in 2003, followed by 'Krrish' in 2006. 'Krrish 3' is slated for release on November 4.
The film also stars Priyanka Chopra, Kangna Ranaut and Vivek Oberoi.
Meanwhile, Big B is also geared to launch the forthcoming season of his hugely popular reality game show 'Kaun Banega Crorepati'.
Photos: Akshay Kumars son Aarav's night out in Juhu
Photos: Shilpa Shetty, son Viaan, Geeta Basra on 'Aunty Boli Lagao Boli' sets
Photos: Isha Ambani and mom Nita show their stylish side
Photos: Ileana D'Cruz flaunts plunging neckline in black dress
Photos: Shamita Shetty, Bhumi Pednekar at fashion show