Spoiler alert! Please do not read the following plot summary if you have not seen the film.
An alien (Aamir) lands on earth and is immediately robbed of the only thing he's wearing - his remote to get back to his planet. Wandering desperately, the alien learns he must wear clothes, which he steals from couples making out in 'dancing cars'. He also learns he needs notes to buy food - and he needs to learn a human language which he can only do by holding hands for six hours.
One day, the alien - whose name becomes 'PK' after people think his bizarre antics mean he's drunk - gets knocked down by rustic musician Bhairon Singh (Sanjay Dutt). Bhairon likes the strange guy and thinks he's longing for a woman, so he takes him to a bordello. Here, PK holds a girl's hand all night - and thereby her language, Bhojpuri, is transmitted to him, finally enabling him to express himself.
PK tells Bhairon his valuable remote has been stolen. Bhairon tells him to go to Delhi to search for it but in Delhi, PK is only chased away by unsympathetic cops. People brush him off, telling him God knows where his remote is. Seeking God, PK now goes to temples, churches and mosques but he's utterly confused as each has different ways to worship and different rules. PK can't find God and starts handing out pamphlets seeking the divine. This is how he meets Juggu (Anushka), a TV reporter who saves him from being beaten in a temple, then follows him to the lock-up to learn his story.
Juggu is shocked to hear that PK's remote is now with Sadhu Tapasvi ji (Saurabh Shukla), her family guru, but is determined to get it back for him - using his straight, simple, clear questions and honesty as weapons. Using PK's concept of 'wrong numbers' to the divine against fake god-men, she convinces her channel head Cherry (Boman Irani) to produce a show pitting PK against Tapasvi. PK meanwhile has fallen in love with Juggu but can't say it when he learns she's broken-hearted, thinking her Pakistani boyfriend Sarfaraz (Sushant Singh Rajput), who met her as a student in Belgium, had ditched her, which Tapasvi ji had warned her father (Parikshet Sahani) about and which caused a huge family rift for Juggu.
Meanwhile, Bhairon catches the thief who had looted PK's remote and brings him to Delhi, but both perish in a terror bomb blast which leaves PK shaken. In the TV show later on, Tapasvi ji challenges PK to tell the truth of Sarfaraz's story and take back his remote. PK reveals how a mistaken letter - and not religious differences - parted Sarfaraz and Juggu. Cherry rings the Pakistani Embassy in Belgium live on TV and Juggu and Sarfaraz are reconciled after which PK wins back his remote.
PK is escorted by Juggu to the desert where he's called his spaceship. As he leaves, she discovers he loves her but PK has also learnt to lie and says he's carrying back various sounds from earth where in fact his transistor tapes only contain Juggu's voice. She later writes a book on PK, saying how much she misses him and how he gave her two great gifts - her father's love and Sarfaraz.
PK returns to earth one year later with a new research team, also containing Ranbir Kapoor as an alien.
TRIVIA
Here are some of the responses from Twitter...
Positive tweets
Even with its little niggles here and there, PK is head and shoulders above everything that has released since Queen.
— Shailesh Kapoor (@shaileshkapoor) December 19, 2014 Some may say PK is not Rajkumar Hirani's best work. Well at his weakest Hirani would be better than the best in the industry.
— anewradha (@anewradha) December 19, 2014 I've often experienced ppl clapping at the end of a movie but 4 the 1st time I saw ppl clapping at the interval time of #PK Unbelievable!!
— Faridoon Shahryar (@iFaridoon) December 19, 2014 Finally a Hindi film where people r talking about quality of film rather than box office numbers. Thank you @aamir_khan @RajkumarHirani #pk
— Shekhar Kapur (@shekharkapur) December 19, 2014 Simple yet effective.Adorable because it never tries to be "cool".Maybe not perfect but very Indian in both, d sentiment & d song/dance #PK
— Kritika Kamra (@Kritika_Kamra) December 20, 2014 While watching @PKTheFilm my wife texted me,the film gave answers to our 6yr old daughter's many a questions about religion!PK is a child!.
— resul pookutty (@resulp) December 20, 2014 Enjoyed #pk woke up thinking about it not Raju hirani's best but better then most movies watch it for one of @aamir_khan best performances
— goldie behl (@GOLDIEBEHL) December 20, 2014 Can't stop thinking how good #PK is.@aamir_khan @rajuhirani you are not from this planet 😄what a amazing film
— Mitumindblowing (@mitublange) December 20, 2014 Pk is a simple social message story movie.But making and dialogue is too much beautiful that any other movie.and @AnushkaSharma I only see u
— yagnesh popat (@PoppatYagnesh) December 20, 2014 @aamir_khan Just Watched #PK Damn Awesome... @RajkumarHirani A Smooth Story With A Wow Ending & A Message Too #PKaayaWithMonster
— Siddharth Purohit (@sid_purohit) December 20, 2014 @aamir_khan @RajkumarHirani Thank you for restoring my faith in Bollywood with #PK. Stellar performance by the whole cast !!
— Abhishek Nair (@abhishek_nair_) December 20, 2014 Negative tweets #PK had the perfect chance to play havoc with multiple, crucial issues in India, but was hung up on only religion. A missed opportunity :/
— Steve (@SteveUnknown) December 19, 2014 I think a bad mood and sky high expectations ruined PK for me. Have yet to meet one person who didn't LOVE the movie. @RajkumarHirani
— Amit (@TimeToScoot) December 20, 2014 - What is the release date of 'PK'?
Release date of Aamir Khan and Anushka Sharma starrer 'PK' is 2014-12-19. - Who are the actors in 'PK'?
'PK' star cast includes Aamir Khan, Anushka Sharma, Sushant Singh Rajput and Saurabh Shukla. - Who is the director of 'PK'?
'PK' is directed by Rajkumar Hirani. - What is Genre of 'PK'?
'PK' belongs to 'Comedy, Drama' genre. - In Which Languages is 'PK' releasing?
'PK' is releasing in Hindi.