In what may be a role reversal in reel life, actor Abhishek Bachchan is all set to play Amitabh Bachchan's father in R Balki's upcoming film 'Pa', ‘Femalefirst’ reported.

The details about the film are being kept under wraps but Big B has already hinted in his blog that his look will be a surprise.

"In 'Pa' Amitabh plays the alienated and slightly retarded son of Abhishek, and his look has been specially created by make-up men flown in from London," a source told the website.

The mega star had earlier said that he spends five hours a day in make-up for his role in the film but there is not much known about his character or storyline of the film.

However, some reports suggest that the superstar will be seen without his signature French beard in the film.

The project is being kept a secret, with no-one from outside the unit being allowed on set, and those who are working on the production are not permitted to speak about the film to the media.

This will be Bachchan's second project with Balki, who had earlier given the actor a make-over in 'Cheeni-Kum'. Bachchan had played quirky chef, who falls for a woman half his age in the film.