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. Bauua lives with his father Ashok Singh (Tigmanshu Dhulia) and mother Beena (Sheeba Chaddha). Bauua is best friends with Guddu (who has one glass eye) and uses his father's money to randomly distribute it among his friends. Bauaa blames Ashok for his short, but not dwarf, stature. Bauua is a huge fan of Bollywood actress Babita Kumari and never misses her movie in the theaters.

After using matrimonial agencies with little luck, Bauaa eventually finds his companion in Aafia Yusufzai Bhinder (Anushka Sharma), a NSAR scientist (a fictionalized depiction of NASA) with cerebral palsy.

Aafia's father is a Punjabi, and her mother is an Afghan. Despite her disability, her parents made Aafia capable enough to be employed by NSAR as a senior mathematician. She has created a zero-gravity simulator on Earth. Afia is also in charge of NSAR's first human space flight to Mars and came back to India, so the mission could be executed at a more reasonable cost.

Bauua finds Aafia's photo in the desk drawer of his matrimonial agent Dikshit Pandey (Brijendra Kala). He is fascinated by her photo and goes to meet her. Bauua goes to a school where Aafia was being publicly honored. Initially, Bauua runs away after seeing Aafia, but a student catches Bauua (assumes he is a fellow student) and gives him a punishment. Aafia comes by and recognizes Bauua as the one sent by Pandey for a meeting.

Aafia is a space engineer who found water on Mars and Bauua is 10th fail. Aafia insults Bauua and is astonished that a man like Bauua could even think of marrying her. Aafia throws him out. Bauua goes back for revenge, but only ends up admiring her courage and grit at a press conference. Bauua throws a pen on the ground to demonstrate that he can pick it up, but Aafia cannot. Aafia gets down from the wheelchair, crawls to the pen slowly, and picks it up, humbling Bauua.

Bauua is intrigued by Aafia and apologizes to her at a party. Bauua treats Aafia like a normal girl and shares a Shammi Kapoor dance number with her right at the party. Bauua shows Aafia a life she has never seen. He takes her dancing, drinking and Holi and brings life alive for her. Bauua organizes Holi at the same expensive hotel that Aafia was staying in. He had to bribe the manager with Rs 50,000, hired an orchestra for Rs 250,000, their costumes for Rs 150,000, nasty kids for Rs 80,000 Rs 20,000 for the Holi sprays and Rs 150,000 for his own suit.

Meanwhile, Bauua enters a dance competition with the winner getting a chance to meet Babita Kumari.

In the events that followed, both Bauua and Aafia 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 years. By the time her father realized his mistake and came back 20 years 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 NSAR 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 NSAR 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.