Mahavir Singh Phogat rêvait d'être lutteur professionnel et de remporter une médaille d'or pour l'Inde, mais a été contraint d'arrêter. Il place alors tous ses espoirs sur le fils qu'il aimerait avoir. Après la naissance de sa quatrième fille, il baisse les bras. Un jour, une mère vient se plaindre que ses fils ont été passés à tabac par les deux filles aînées de Phogat. Il découvre alors chez elles l'amour du combat, et décide de les entraîner à son sport de prédilection.
Samar Anand (Shahrukh Khan), a major in the Indian Army, defuses a bomb in Ladakh without fear or regard for his safety. Akira Rai (Anushka Sharma), a Discovery Channel filmmaker, dives into a river in Ladakh on a dare and soon regrets it after learning she has plunged into freezing water. Samar, who happens to be by the shore, rescues her. Samar gives her his jacket and leaves without retrieving it. Later, Akira finds his diary in the jacket pocket and begins reading.
At the beginning of the film, Kabir (Abhay Deol) proposes to Natasha (Kalki Koechlin). Their families meet at the engagement party where Natasha learns that Kabir is planning a three-week bachelor road trip to Spain with his school friends Imraan (Farhan Akhtar) and Arjun (Hrithik Roshan). Kabir explains that the three have a long-standing pact, and that during the road trip, each of them will have to pick an adventure sport, which all three will try together. Initially, Arjun is reluctant to take trip as he does not want lose his pay for missing work. It is later revealed that Arjun's ex-girlfriend left him due to his workaholism & obsesion with money. Imraan has an additional personal agenda on the trip: to find his biological father Salman Habib (Naseeruddin Shah), an artist in Spain.
In Sultanpur, a picturesque village in Pakistan, villagers have gathered to watch a game of cricket between India and Pakistan on television. Among them is a pregnant woman (Meher Vij) who, after giving birth, names her daughter Shahida after Shahid Afridi, the player who had won the game for Pakistan. On an afternoon, a six-year old Shahida falls off a cliff, but is saved by an overhanging tree. She loses her ability to speak from the accident. Her worried mother takes her to the shrine of Nizamuddin Auliya, a Sufi saint, in Delhi, on the belief that it would regain the latter's speech.
Raj Malhotra (Shah Rukh Khan) and Simran Singh (Kajol) are non-resident Indians living in London. Simran was raised by her strict and conservative father, Baldev Singh (Amrish Puri), while Raj's father (Anupam Kher) was very liberal. Simran always dreams of meeting her ideal man. Her mother Lajjo (Farida Jalal) warns her against this, saying dreams are good but one should not blindly believe they come true. One day, Baldev receives a letter from his friend Ajit (Satish Shah), who lives in Punjab. Ajit wants to keep a promise he and Baldev made to each other 20 years ago—to have Simran marry his son Kuljeet (Parmeet Sethi). Simran is disappointed—she does not want to marry someone whom she has never met.
In the year 1990, Iqbal Haroon Khan (Jackie Shroff) runs The Great Indian Circus in Chicago, which has fallen on bad times. Anderson's (Andrew Bicknell) bank — Western Bank of Chicago —, which has lent money to Iqbal Khan, decides to close down the circus when Khan is unable to repay the loan. Young Sahir (Siddharth Nigam), the little son of Iqbal Khan, pleads with Anderson not to shut down his father's circus, as he and his father would soon be able to turn the corner. But Iqbal Khan's presentation before the bankers and Sahir's pleas don't help. Iqbal Khan commits suicide in front of the heartless Anderson, leaving Sahir devastated.
Farhan Qureshi (R.Madhavan) and Raju Rastogi (Sharman Joshi) are students at the Imperial College of Engineering (ICE), a highly regarded Indian engineering college. Farhan's passion is wildlife photography, but he pursues an engineering degree to appease his father. Raju chooses engineering with hopes of improving his family's financial situation, but his lack of self-confidence results in poor grades. Their third roommate and friend, Ranchodas 'Rancho' Shamaldas Chanchad (Aamir Khan), has immense interest in robotics, and invents in his spare time. Rancho regularly faces the wrath of the college's director, Dr. Viru Sahastrabuddhe (Boman Irani), known as "Virus", when he gives creative and unorthodox answers in class. He lives by the philosophy that one should pursue excellence, as when it is achieved, success follows. Virus is shown as an extremely strict person—so strict that he caused his own son's suicide by putting him under excess pressure. The star student of their class is Chatur Ramalingam (Omi Vaidya) nicknamed "Silencer", known for his incredible techniques of memorization but more notorious for his silent but malodorous flatulence in addition to his arrogant attitude. Catering for them and the other college students' needs is Man Mohan, nicknamed "Millimeter".
Yuvraj Vijay Singh (Salman Khan) est un prince strict et seul. Il n'est en effet pas proche de ses demi-sœurs, son demi-frère essaie de le détrôner et il est en froid avec sa fiancée, la princesse Maithili (Sonam Kapoor).
Rahul Mithaiwala (Shahrukh Khan) is a forty-year-old bachelor living in Mumbai. His parents died in a car accident when he was eight years old, so his grandparents raised him. His grandfather (Lekh Tandon) owns a chain of confectionery shops where Rahul has been a dedicated worker helping his grandfather. Two of Rahul's friends convince to finally take a vacation and travel with them to Goa. Rahul's grandfather dies on the day of the 100th birthday celebration. His grandmother tells Rahul that his grandfather wanted his ashes to be divided into two parts—one of each to be immersed in the Ganges and Rameswaram. She asks Rahul to take the ashes to Rameswaram and disperse them. While he accepts her request, Rahul and his friends plan to dump the ashes at Goa but his grandmother wants to see him off, forcing Rahul to travel by train. He books a single ticket on the Chennai Express, planning to quickly exit and meet his friends along the way. However, as he tries to leave the train, he notices a young woman running to board it. He helps her and then four large men board the moving train, missing his chance to debark.
Randhir Bakshi et Dev Malik, pères respectifs de Kaali (Shah Rukh Khan) et Meera (Kajol) sont chefs de deux gangs adverses de la Mafia, ils sont ennemis depuis de nombreuses années. Avec l’intention de reprendre la cargaison d'or que le gang des Bakshi aurait volé, Meera commence à fréquenter Kaali quotidiennement, ce dernier ne connait pas sa vraie identité, et tombe amoureux d'elle. Meera réussi à lui faire avouer toutes les informations sur la cargaison d'or lors d'une de leur discussion, elle décide de reprendre l'or le jour de son anniversaire, jour qu'elle pense idéal pour faire ce cadeau à son père. Kaali est déçu et se sent trahi, il décide tout de même de la voir une dernière fois afin de lui dire deux mots, lors de cette rencontre, il va lui sauver la vie, ce qui va la faire tomber amoureuse de lui à son tour. Malgré quelques hésitations Kaali finit par pardonner Meera, et ils finissent par sortir ensemble. Meera veut faire un pas de plus dans leur relation et ils décident de convaincre leur pères pour leur mariage.
Au début du XVIII siècle, le Chhatrapati Shahu (Mahesh Manjrekar) requiert les services d'un nouveau peshwa, réel détenteur du pouvoir politique et militaire dans l'Empire marathe. Bien que Panth Pratinidhi (Aditya Pancholi) se désigne pour assurer cette fonction, le ministre Ambaji Panth (Milind Soman) choisit de nommer le jeune Bajirao (Ranveer Singh). Afin de tester sa sagesse spirituelle et sa maîtrise des armes, Silpa défie Bajirao de sectionner une plume de paon avec une flèche. Bajirao réussit et se voit attribuer le titre de Shrimant Peshwa. Dix ans plus tard, la femme de Bajirao, Kashi Bai (Priyanka Chopra), rend visite à son amie Bhanu, veuve depuis l'exécution de son mari accusé d'espionnage. Bhanu prédit amèrement un triste sort aux époux, jusqu'alors unis et admirés de tous.
The world's oldest desert in Namibia; A solitary railway line & A royal family on a royal journey. Mr. A (Hrithik Roshan) sky-dives and lands on a train that is carrying the Queen. He steals her crown by disguising himself as the Queen, beats her guards easily and escapes. Newly promoted officer Ali (Uday Chopra) and Jai Dixit (Abhishek Bachchan) are introduced to Shonali Bose (Bipasha Basu), a special officer assigned to investigate Mr. A's case, who also happens to be a former classmate of Jai. After the initial investigation, Dixit analyses the underlying trend in Mr. A's heists. As per his analysis, a theft in one of two famous Mumbai city museums will follow.
Naina (Deepika Padukone) is a shy and nerdy medical student. She studies constantly and always tops her classes, but she feels like an outcast. An encounter with an old classmate, Aditi (Kalki Koechlin), makes her realize that she wants more from life than high marks. Thus, she makes an impulsive decision to follow Aditi on a commercial hiking trip into the Himalayas, up to Manali. During the hike, she renews her friendship with other former classmates, Kabir Thapar aka "Bunny" (Ranbir Kapoor) and Avi (Aditya Roy Kapur). Bunny is a handsome charmer whose dream is to wander and discover the world. He does not plan to marry or settle down. During their trip, seeing Aditi's silent reactions to Avi's constant flirting with other girls, Bunny and Naina realize that she has a secret crush on Avi, but do not bring the matter to surface.