Munnabhai, a dreaded but good-hearted gangster of Mumbai falls in love with Komal. He is so smitten by her that he starts visualizing her at every point of time. To overcome this habit, he visits Doctor Rastogi, who advises him to woo the girl. But the girl in turn is in love with Raja, a bouncer in a bowling alley. Soon after, Doctor realizes that Don is in love with none other than his own sister. To protect her, they both fly down to Malaysia along with Ajay as her bodyguard, to marry her off. Not the one to be left behind, Munnabhai also follows them. Helpless and powerless in Malaysia, Munnabhai plays a smart trick and all are deported back to India. Now what will happen when they land in Mumbai? Will Doctor be able to save his sister? Who will marry Komal, Raja or Munnabhai?