Mungilal (Anupam Kher) was once a small time Don in Mumbai way back in the 70s, in Mumbai. He had a childhood friend Jignesh. When the law-enforcing authorities turned the heat on the Bhais in Mumbai, Moongi and Jignesh(Satish Shah, Moongi’s childhood friend cum business advisor) fled to Bangkok, where, later, Mungilal became a don.
In the AABM (All Asian Bhai Meet) the main agenda is to discuss and assess the falling sensex of Bhaigiri in Asia. In the discussion, a rival Don of Mungi's, Fursat Lala (Gulshan Grover) proposes an ambitious plan for a piece of land in Alibagh and puts across a valid argument that start in the business of Bhaigiri, it is very important to have a waris. Since Moongi has no waris and no plan for the development of that land, it is only logical that the next man, i.e. Fursat Lala should be made the new Don of Mumbai.
Moongilal assures the syndicate that he has a better plan and that he even has a waris, who he will present before the syndicate and asks for a one month's time to do the same. He is granted this much time in view of his past services.
Mungi reveals to Jignesh of his noble plan to build a hospital on that land because in his childhood his father died at that place for lack of medical aid.
Moongi and Jignesh find a letter of Moongi's estranged sister Angoori (Bhavana Balsawar) whom Moongilal had thrown out years back because she married without consent. The letter reveals that Angoori gave birth to Kamal. This child, who looks like mama Moongi, smiles like him and ever has a mole on his right thigh just as mama has one his.
Mungi is thrilled and resolves to hunt his waris in Mumbai where he comes across a Peter Sellers like detective Johnny English (Satish Kaushik) who promises them to find Kamal, the waris, in 20 days. In return, Mungi promises to pay Rs50 lakhs to him if he finds Kamal for him.
The trouble starts when four different ‘Kamals’ surface with different proofs and confuses Moongilal. And thus starts a journey of hilarious situations.
Will Moongi find the real waris and get to make the hospital? This Dhoom Dadakka story of good people in bad situations, told in a totally rip-roaring style will tell so!