The story opens in the bustling lanes of Mumbai's Dadar. Munna Bhai (Sanjay Dutt) is a powerful, kind-hearted don who rules the underworld with an iron fist wrapped in a velvet glove. He has one weakness: his parents in Uttar Pradesh believe he is a high-class doctor. When his father announces a visit to see his son’s prestigious medical practice, the lie begins to crumble.
Munna starts his journey with a negative motive—revenge against Dr. Asthana. However, as he interacts with patients and understands the value of a doctor's role, his intent shifts to serving people. Munna Bhai M B B S