UTV Motion Pictures, Hari Om Entertainment Company and Three’s Company Productions Pvt. Ltd.’s Joker is a fictional tale about an imaginary Indian village, Paglapur, which is on the border of three states, Prajasthan, Uttam Pradesh and Mukhya Pradesh, yet not part of any of them. Because of this, it has remained under-developed and has been taken over by in mates of a mental asylum in the vill age. Paglapur does not even have electricity!
Agastya alias Sattu (Akshay Kumar) hails from Paglapur but now works as a researcher in America. He has been given a grant to establish contacts with aliens and is working hard on the project without much success. After his deadline, he is granted a month’s grace period to succeed in his mission, failing which he would be replaced by a more worthy candidate. Simon (Alexx O’Neil) is Agastya’s arch rival and is waiting to replace him. Agastya lives with his girlfriend, Diva (Sonakshi Sinha).
One day, Agastya gets to know that his father (Darshan Jariwala) is serious and nearing his end in Paglapur. He sets off for his village, accompanied by Diva. Once there, he realises that his father is fine and had called him over so that he could do something to improve the lot of the villagers. Agastya is thrilled to meet his brother, Babban (Shreyas Talpade), friend Sundi (Vindu Dara Singh), Rajaji (Sanjay Mishra), Guruji (Asrani) and others. He first meets the ministers of the three states of Uttam Pradesh (Avtar Gill), Mukhya Pradesh (Swatantra Bharat) and Prajasthan (Anjan Shrivastava) to ask them to do something for Paglapur and its people. But each of the ministers turns down his request and their PAs (Kanchan Pagare, Premchand and Bikramjeet Kanwarpal) do little to help Agastya.
Driven to his wits’ end, Agastya, with the help of the villagers, has crop circles made in the village to give the impression that aliens have invaded Paglapur and made the crop circles. The aim is to get Paglapur in the ambit of the media and, through it, to the notice of the government. Sure enough, the national and international media swarm Paglapur and buy the story that an obscure village has been invaded by aliens. Even as television reporters are waiting to capture the alien/s on their cameras, Simon reaches Paglapur and calls Agastya’s bluff.
Not to be outdone, Agastya now dresses up Kachhua (Pitobash Tri pathi), Babban and others as aliens to mislead the media. He and the villagers kidnap Simon when he tries to expose their game. They set Simon free when Agastya feels that the media is convinced about the presence of aliens in Paglapur. The ministers of the three states are now willing to adopt Paglapur and do anything for it. However, Simon once again calls Agastya’s bluff and it appears, the game is over. Most of the media persons and the army and commandos, which had also been deployed, have started to leave Paglapur.
A dejected and crestfallen Babban who, incidentally, speaks in an alien language and can’t speak in the language used by human beings, prays to God to save Agastya and Paglapur. Agastya is being arrested by the police for cheating everybody. Just then, Babban establishes contact with an alien through Agastya’s computer. The alien actually lands in Paglapur in a spaceship and speaks to Babban. The alien convinces the people of Paglapur that it has been keeping an eye on Paglapur.
What happens there- after? Do the villagers of Paglapur benefit in any way? Does the lot of Paglapur improve in any way? What about Agastya’s mission to establish communication with aliens? Does the Paglapur episode work as his project?