The 71-year-old actor has already shot for "Comedy Nights With Kapil", and he recently visited the set of "Boogie Woogie" and "India's Got Talent".
Sharing his experience on "Boogie Woogie" via his blog, Big B posted: "It goes down well as did the promotional on 'India's Got Talent' some days ago. But really, the degree of talent that is of witness at these competitions is quite simply audacious and of a standard not seen before. Astounding!"
"These are little ones in the range of 11 to 14 years or even less, and they perform to a degree that cannot be anything but professional...and they have had no training or scouts picking them up, or any kind of sponsorship for their future."
"They have played in common open spaces, and picked up a craft which has brought them to the finale of this show," he added.
The actor, who has three grandchildren - Navya Naveli and Agastya from his daughter Shweta Nanda, and Aradhya from son Abhishek, finds it "cruel" to declare a winner from amongst a select few kids on such reality shows.
"Announcing their victory...indeed the victory of one among five unbeatable ones is a destruction of our inner selves. It almost becomes a cruelty to give one above the other, for they are all excellent. But a winner has to be declared, and a list of losers to bear," he said.
For Big B, they are "all winners".
"May god bless them and their talent," he added.
"Bhoothnath Returns", directed by Nitesh Tiwari, is the sequel to 2008 film "Bhootnath". The film will hit theatres April 11.
