Munna Bhai, a don falls in love with an RJ Janvi. In a way to impress her Munna lies Janvi to be a professor and this lands up Munna at an old age home carried by Janvi to lecture the oldies about Mahatma Gandhi. The process gets Munna to see Gandhi in real and adapt the path of \'Gandhigiri\' rather than \'Bhaigiri\'. This all creates lot of comic confusion along with Munna to be declared mentally ill.