Ashfaque (Ajay Devgan) is a small town boy who aspires to be a film
star in the Hindi film industry. He joins a street theater group.The
theater group is  run by a reformed dacoit named Sidhu (Pankaj Kapur)
who uses street theater as a medium to bring about mass-awakening .
Ashfaque struggles to give a creative vent to the actor in him in order to realize his dreams.

Ashfaque's
strong determination and hard work  pays off and ultimately, he gets a
break in films. He changes his original name in to a  new screen name -
Sameer Khan.
As time passes, the roles start becoming better and
he moves up the success ladder in a very short time. He becomes Sameer
Khan the superstar - one who can enact any role with finesse, get under
the skin of any and every character with ease and walk away with
audience applause.

Unfortunately, amidst all adulation and
applause, he gradually start losing his own identity. He forgets his
real self and imbibes all characteristics of the various roles essayed
by him on screen. His entire system is taken over corruption, which
makes him an alien to all his loved ones, including his wife Sneha
(Vidya Balan).

A shocking incident at a party changes
everything, rocking Sameer Khan's lifestyle. He gets caught between his
human self on one side and his corrupted superstar image on the other.
Is the conflict within him gives way to good sense?
Is he able to discard his corrupted image and emerge as a true life hero?
Find the answer in the movie "Halla Bol".