ar 2012 is going to be interesting as the super heroes of Bollywood turn into villains. The three Khans and the baba of Bollywood -- Shah Rukh Khan, Aamir Khan, Salman Khan and Sanjay Dutt are all set to be bad in their forthcoming movies.

The most celebrated negative role by any hero in Bollywood is Shah Rukh Khan's negative role in Don. And this time the King Khan is preparing to hit the silver screen with another negative role in 'Don 2: The Chase Continues' which is scheduled for release on Dec. 23, 2011.

Surprisingly, Sanjay Dutt too is returning to an important negative character called 'Kancha Cheena' in Karan Malhotra's upcoming film 'Agneepath.'

The new avatar of Sanju in negative role 'Agneepath' is slated for release on Jan. 26, 2012 coinciding with the Republic Day. In the film, the main villains will be played by Sanjay Dutt and Rishi Kapoor.

After breaking the records of box office history with 2.7 million rupees gross collection by his all-time blockbuster movie '3 Idiots' Aamir Khan will be seen in 'Dhoom 3', this time in the negative role played similar to the one played by John Abraham and Hrithik Roshan in 'Dhoom' and 'Dhoom 2', respectively.

The buzz is that, knowing the six-pack of Aamir Khan in 'Ghajani' (2008), this time the protagonist Abhishek Bachchan who never bothers about his body during the six packs evolution of Bollywood, is undergoing a practice to match with his opponent Aamir in the film.

According to a report Abhishek, who is currently shooting 'Bol Bachchan,' works out for thirty minutes every day and eats every two hours, and "his diet includes lots of protein and carbohydrate."

His workouts include "circuits training, weights and pull-ups. He also needs to bench press his own weight."

The most exciting news is that the 'Bodyguard' hero Salman Khan's 'Mogambo' role in Anees Basmee's film, which is part of the 'Mr. India' series to be titled 'Mr. India 2' in 3D.

Salman Khan is also playing the negative role of 'Mogambo' that was played by Amrish Puri in the 1987's super hit film 'Mr. India'.

"Yes, Salman Khan will play a negative role in the sequel, just like Amrish Puri did in 'Mr. India'," confirmed the producer of the film Boney Kapoor.