Plot

Through his relationships with two wildly different women, a vertically challenged bachelor with a larger-than-life persona must discover his purpose.

The story revolves around Bauua Singh (Shah Rukh Khan), a vertically challenged man, who is full of charm and wit, with a pinch of arrogance. Born to a wealthy family and raised in an environment of affluence and indulgence, Bauua was never failed by Meerut or its people. But when he meets two women (Katrina Kaif, Anushka Sharma), his experiences with these women take him on a journey to complete his 'incompleteness' and broaden his horizons to find a purpose he never knew he had.

Bauua Singh (Shahrukh Khan) is a short, 38-year-old man from Meerut who has trouble finding a marriage partner. After using matrimonial agencies with little luck, he eventually finds his companion in Aafia Yusufzai Bhinder (Anushka Sharma), a NASR scientist (a fictionalized depiction of NASA) with cerebral palsy. Bauua finds Aafia's photo in the desk drawer of his matrimonial agent. He is fascinated by her photo and goes to meet her. Aafia is an space engineer who found water on Mars and Bauua is 10th fail. Aafia insults Bauua and throws him out. Bauua goes back for revenge, but only ends up admiring her courage and grit at a press conference. Afia is also in charge of NASR's human space flight to MARS. But Bauua shows Aafia a life she has never seen. He takes her dancing, drinking and Holi and brings life alive for her.

In the events that followed, both fall in love with each other and have sex. Bauua dumps her after five months. However, Aafia comes looking for him, and Bauua's parents fix their marriage. On their marriage day, Bauua's friend Guddu (Mohammed Zeeshan Ayyub) tells him that he is shortlisted for a dance competition where he applied, where the winner gets a chance to meet Babita Kumari (Katrina Kaif), a Bollywood actress. Bauua, determined to meet Babita, runs away from the marriage after a confrontation with Aafia, leaving everyone devastated.

Bauua wins (contest judged by Salman) and gets to meet Babita at a party, accompanied by other famous Bollywood actors. Babita offers him a job after he displays an ability to guess what goes on in people's mind by observing their expressions. He accompanies her on film schedules and award functions, helping her patch up with her ex-boyfriend Aditya Kapoor (Abhay Deol), who had previously cheated on her. They spend a lot of time with each other and tell each other their life stories. Babita tells Babua how her parents used to work in a circus and got married. But the daughter of circus's owner lured her father away and he left his wife for her. Babita's mother was heartbroken and left, and got married after 5 yrs. By the time her father realized his mistake and came back 20 yrs later, her mother was long dead. One day, Bauua realizes his wrongdoings and wishing to reconcile with Aafia, willingly creates an argument at a party organized by Babita, following which Babita throws him out and breaks all ties with Aditya, realizing the latter is cheating on her again.

Bauua and Guddu travel to New York, where Aafia is attending a seminar. Bauaa crashes the seminar to meet her, but Aafia refuses to see him. Aafia's father tells him that Bauua has fathered a son with Aafia and the latter is pregnant, due to which she wanted him to marry her in the first place. A heartbroken Bauua decides to leave the city, but decides to try his luck one more time. After meeting with Aafia again at NASR and getting rejected by her, Bauua enlists in a program recruiting human volunteers to be sent to Mars on a rocket. After painstaking training and getting help from one of the applicants, Bauaa gets selected, while Guddu is rejected for his vision disability. On the day of his launch, Aafia, who is supposed to marry Srinivasan (R. Madhavan), a fellow scientist and Aafia's colleague, leaves him, and she reaches NASR seconds before Bauua's launch. Bauua assures her that he always loved her, just before the rocket takes off. The launch is witnessed by Aafia, Guddu and Srinivasan, along with Babita and Bauua's family via television broadcast. The launch is successful, and the rocket thrusts off in space.

In a voice-over by Aafia, it is revealed that Bauua eventually reaches Mars, and sends a video recording of himself from there. His rocket gets lost in space somewhere while returning, and Aafia waits for him, having broken her marriage with Srinivasan. Fifteen years later, a Chinese space station receives the signal of Bauua's escape pod, which crash lands in an ocean, revealing Bauua is still alive and has not aged.