The upcoming movie is the third from the superhero series. The film will continue the story of Rohit Mehra and his superhero son Krrish, after "Koi... Mil Gaya" (2003) and "Krrish" (2006).
"Up at 7 am 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 actor posted on his blog.
Bachchan is also preparing to host the seventh season of popular game show 'Kaun Banega Crorepati', which will be shot at Yash Raj studio this year.
"Rushed to YRF to partake in the rehearsals for KBC, yes this year it is being held at YRF, closer and hopefully quieter and more disciplined a facility," he said.