After Rehaman's father dies on duty, as compensation, he is offered his father's job as a home-guard. Under special recruitment, he gets selected for the post of a police constable.
On his first day at work, a dreaded criminal, Mr. Bhai. escapes from prison because of which the sub-inspector calls him an iron leg. In a comical series of events, Rehaman finds himself working on the mission with the same sub-inspector to capture the escaped don.