This is a story based in 2005-06, the times of military aggression and war in Iraq and Afghanistan. Set in this time is our central character of Mr Bhatti (Anupam Kher) a bank clerk, a lovable yet lonely nerd. Mr Bhatti dares to do what we prefer to discuss with our morning cuppa and forget soon after. He has the passion to implement his peace plan aimed at 'Saving the World'. And he will not stop at anything until he achieves it...

The key to that plan is Mr. George W Bush whom Mr. Bhatti has been trying to contact at the White House from his bank telephone, so that he doesn't have to pay for the ISD calls!

But strange things are happening to the man who wants to save mankind… this delusionary man is being followed and photographed. Wonder who these guys are?

Suddenly, Mr Bhatti realises that he has actually won a FREE trip to Europe, though he has entered no contest. Who has sent him the ticket and the hotel package free of cost? How can Mr. Bhatti go on this trip without telling his favourite star, Mr. Amitabh Bachchan about it? Never mind, if he has only met him in his dreams, thus far...In reality, all Mr. Bhatti can manage is to stand outside Mr. Bachchan's bungalow with a crowd, awaiting a glimpse of his hero.

Now to Mr Bhatti's Chutti.

Bhatti arrives at the picturesque lake district in England with a group of tourists. Strange happenings follow Mr. Bhatti even on his chutti. An English beauty, Alice, falls in love with him, never mind his eccentricity. Mr. Bhatti, for the first time in his life, feels the power of being overpowered by a woman's attention... He goes crazy with so much attention being showered on him. He tries hard at all times, but cannot manage to suppress his excitement. Stranger things await him... soon.... Alice vanishes and is presumed dead.... murdered, actually.

Mr. Bhatti, naturally is the prime suspect. When the U.K. police check him out for criminal records on their data, it is revealed to them that he is not Mr. Bhatti but the dreaded terrorist Abu Siddique.

Is Abu Sidique masquerading as bufoon Bhatti? Javed Khan (Abid Ali) who plays a Pak -born cop, now with the U.K. police digs deeper. And he realizes that Mr. Bhatti merely has a strange resemblance to the wanted terrorist, Abu Siddique, the mastermind behind the U.K. bombings. Abu Siddique has flown the nest!

The U.K police try to convince Bhatti to pretend to be Abu Siddique. Bhatti refuses. And it takes all of Javed Khan's effort to get his friend Mr. Amitabh Bachchan to come in to play and to convince Mr. Bhatti to agree. From Mumbai, Mr. Bachchan convinces Bhatti to save the world by taking on the persona of Abu Siddique.

How can Bhatti refuse Bachchan? Bhatti infiltrates into the Abu Siddique gang. Which is fine.

But what about Abu's girl freind, Katy? She thinks he is the real Abu and comes on too strongly on to him. And poor Bhatti is a virgin. Through all this Mr. Bachchan keeps advising Mr. Bhatti to do the right thing at the right time.

Katy is unmanageable. And on top of it, Javed khan asks Bhatti to find out what is the gang's real plan? But as Bhatti finds out their plan, the real Abu Siddique finds out that there is someone impersonating him in U.K. He leaves Turkey for UK to add to Bhatti's woes.

It is now, that we learn about a plot within a plot. And all hell breaks loose. Now, the dead Alice also surfaces. And Bhatti gets one shock after another.

Bhatti finds himself face to face with death, and utilizes his last wish to call up Mr. Bachchan. Bhatti tells Bachchan, 'marwa diya aapne'...But can one keep Bachchan down? Mr. Bachchan once again, inspires Bhatti so much that his fan can defy death and fight to save humanity.

Its action stations after this. And Bhatti whom we all thought was an idiot, a buffoon, now turns the tables and to what effect! We realize that to be single-minded about world peace, even at the cost of one's life, can turn an ordinary man in to a hero.

Now it is to be seen if Bhatti's desire to meet Bush and more importantly Mr.Bachchan is fulfilled or not...

Mr. Bhatti on Chutti is, on the face of it, a comedy. But there is much more to it in the larger sense, Mr. Bhatti on Chutti talks about the common man Mr. Bhatti's dream of a workable peace plan in a world ravaged by war and hunger. The film is also a celebration of Mr. Amitabh Bachchan's stardom. He plays Mr. Bhatti's conscience and also his inspiration as he is in real life to millions of us.