Halla Bol is an inspirational story about Ashfaque (Ajay Devgan). He comes from a small town aspiring to become an actor in the Hindi movie industry. Initially,he joins a street theatre group run by an improved dacoit Sidhu (Pankaj Kapur) to make his dream come true. Sidhu uses street theatre to create mass awakening while Ashfaque struggles to give right creative direction for living his dreams. Ashfaque's hard work finally pays off as he gets a break in films. Ultimately, he changes his name from Ashfaque to Sameer Khan and then a superstar.Unfortunately,his reel life success takes toll on his real identity and he loses touch with his real self. But his new corrupt self distances him from his loved one's including his wife, Sneha (Vidya Balan). Everything takes a sudden twist as he founds himself caught amidst his original self and his newly found superstar avatar.