The movie is set in a village where the heroine, Zeenat Aman, lives with her father, and the hero, Shashi Kapoor, comes as an engineer to oversee and build a major dam. The girl is tall, very attractive and also god-fearing, she goes to the temple daily and is a very good singer. The hero falls in love with her, and asks her father permission to marry her. However, she is scared of the marriage.

Since she was a child she loved three things. God, Music and Dancing. Growing up she was happy until that fatal moment as a young child when she was burned by a pot of oil on one side of her face. This destroyed her entire life but she never lost faith.

She is beautiful, but only on one side of the face. The other side had been scarred and disfigured by her child hood injury. She keeps that part of the face hidden by a veil using her sari palloo. She is afraid that he will turn away when he sees her gruesome side of the face. The hero ultimately accepts her and they live happily ever after.

The story starts in the streets of Mumbai, where a gang of high-speed motorcyclists (riding bikes like the Suzuki GSX1300R Hayabusa) are robbing banks and money-vans and disappearing into thin air - or rather into pizza delivery boys - before anyone can say "thief".

ACP Jai Dixit, (Abhishek Bachchan) a no-nonsense cop is called on the case. He seeks the help of a scatterbrained, clownish downtown racer named Ali (Uday Chopra) and devises a trap to catch the thieves, but fails. Kabir,(John Abraham) the leader of the gang, eventually taunts Dixit by saying that he couldn't catch Kabir even if he were right in front of him. He is proved correct and the failure of Dixit seemingly leads to the breakup of his partnership with Ali.

Kabir then lures Ali into his gang to replace Rohit, the gang member who was killed by Jai. Meanwhile, Jai is making out with his wife, Sweety (Rimi Sen). Ali also falls in love with Sheena,(Esha Deol) another gang member. The gang later goes to Goa to perform one last big heist before disbanding forever. Kabir now sets his eyes on the biggest casino in all of India. Kabir and his gang swiftly rob the casino on New Year's Eve, but soon, they realize that Jai has planned them right into a trap. In the end, Kabir rides his bike off of a cliff as Ali and Jai look on. It is not clear if Kabir dies or if he manages to escape; his non-appearance in Dhoom 2 suggests he dies.

Tamanna Sahni (Shilpa Shetty) is a dedicated staff member of a top advertising agency, her ideas and designs have mainly contributed to the success of the agency. She leaves for a college reunion and meets her college sweetheart Rohit (Salman Khan). They rekindle their love for each other and share some intimate moments together. Eventually Rohit leaves and Tamanna settles back into her normal daily routine.

When her sister, Tanya, has an accident she decides to give her own blood to save her. However her doctor, Dr. Raisingh (Revathi), tells her that she has been tested positive for HIV. Tamanna's world turns upside down and she desperately tries to get into contact with Rohit but in vain.

Her situation is soon spread around the office and she loses her job. Angered by her unfair dissmissal she searches for a lawyer to fight her case. Eventually Tarun Anand (Abhishek Bachchan) agrees to represent her. The rest of the story shows if Tarun can help destroy the prejudice put upon Tamanna...

Raj (Salman Khan) is a singer trying to make his way in the cruel big city of Mumbai. He rescues a girl who has fallen in front of a train, and stays with her when she is rushed to a hospital. Pooja Oberoi (Rani Mukerji), the daughter of a wealthy family, survives but falls into a coma. Her family rushes to the hospital and finding Raj there, assumes that he is Pooja's husband, Romi, with whom she had eloped and whom they had never met. Pooja, who is comatose, cannot correct them; Raj, who could correct them, prefers not to.

As the family gets to know the pretend Romi, Pooja's best friend, Jahnvi (Preity Zinta) soon starts spending a lot of time with him. He falls in love with Jahnvi, who is regarded as a second daughter by Pooja's family. How can he can he flirt with his assumed wife's best friend? Then Pooja revives from her coma and complicates matters by falling for Raj. Who does Raj choose - Jahnvi or Pooja? Raj chooses Jahnvi because he really loves her and acted as Pooja's husband out of the kindness of his heart. Raj marries Jahnvi and Rahul (Shahrukh Khan) in special appearance comes in to marry Pooja.

The movie opens with Siddhant Dheer (Sanjay Dutt) as the head of the Anti-Terrorist Cell (a fictitious organisation) uncovering the fact that on May the 10th ('10' in Hindi is 'Dus'), a terrorist attack will take place that will kill 25,000 people. All that is known about the attack is the name of the man behind it: "Jambhal".

Neha (Esha Deol), an agent in Canada, reports to him that one of Jambhal's men, Himat Mehendi, is in a Canadian jail. Siddhant's younger brother Shashank Dheer (Abhishek Bachchan) and co-agent Aditya Singh (Zayed Khan) are sent to kidnap and interrogate Mehendi, keeping the mission unofficial and secret from the Canadian authorities. But things become even more complicated when Siddhant finds that there is an unknown double agent in their midst which forces him to suspect Aditi Kumar (Shilpa Shetty) his love interest and co-agent.

On arrival in Canada, Shashank and Aditya find that the car that had been provided by Neha is rigged to explode if they slow down. A Canadian police officer Dan (Sunil Shetty) chases them apparently unaware that Shashank is driving beyond the permissible speed limit to avoid explosion. After Mehendi (Pankaj Kapoor) is captured, the agents are intercepted by Dan again on a deserted culvert. Here the terrorists attempt to recapture him; Shashank and Aditya fight them off. Dan is caught in the crossfire. Despite their misgivings about blowing their cover, the agents take him to Neha's safehouse. After recovering, Dan joins them.

Himat lead them to a man named Asif, who he claims has turned against Jambhal, along with a man named Irfan. Asif gives them Jhambal's location, and then immediately shoots himself. which Himat says is because of his fear of J.D. Dan and the agents then kill 'Jhambal' in the countryside, and release Mehendi.

All is not as it seems, however. Returning to Neha's safehouse, they find only Siddhant and a body Siddhant claims is Neha's, but is not that of the 'Neha' previously seen. It becomes apparent that the woman they thought to be Neha is a double agent, and the real Neha is dead. Moreover, the man they killed was not J.D, but Irfan, the second traitor. The real 'Jhambal' was Mehendi, and is now free. In fact Neha had rigged the car in the beginning in order to terminate Shashank and Aditya. When she failed she had covered saying that it was a test.

Siddhant also knows that the name of the mission is 'JEET'. He believes that the letters in 'Jeet' refer to their numerical position in the alphabet: 10th, 5th, 5th and 20th respectively. He knows that 10/5 refers to the 10th of May, and believes that the second 5 refers to 5pm, the time of the attack. From that the surmise that the final '20' refers to the 20,000 that will be killed; the only place where such a crowd will be concentrated at that time is a special exhibition football match between India and Canada, with the Prime Minister of India present.

At the stadium, Aditya finds 10 C-4 bombs in a car with the registration 2020. He drives off, attempting to get the car as far as possible from civilization. Shashank finds another bomb and, realising there is not enough time to drive it into the countryside, he takes it to the airport. He meets the double agent Neha, and, after he kills her bodyguards, they both confess their love for each other, pack the bomb onto an aeroplane and take off.

Aditya manages to bring the bomb into the wilderness, escapes from the car onto a helicopter, and the bomb explodes without loss of life. Shashank, however, is unable to find a place to drop the bomb safely, and crashes the plane into a lake, killing himself and Neha. Siddhant confronts an unarmed J.D. in a hotel elevator and shoots the terrorist down, but he is forever shaken by the death of his brother. The film went on to become a huge hit despite the competition from many other films releasing around that time.

Rahul (Shahrukh Khan) and the tomboy Anjali (Kajol) are students at St. Xavier College. They are the best of friends.

Then Tina, (Rani Mukerji), the principal's daughter, enrolls at St. Xavier. She is beautiful, feminine, and sophisticated -- the antithesis of Anjali. Rahul falls hard for Tina, just as Anjali is realizing that she has some feelings for Rahul. She awakens to those feelings just in time to see that it is hopeless. She leaves college suddenly, vowing to forget all.

Tina and Rahul marry and have a child -- whom they name Anjali. Tina dies in childbirth, but previously writes a series of eight letters. Every year, on Anjali's birthday, she is given a letter and hears her mother's loving wishes for her. In the eighth and last letter, the little girl is told about her namesake. Where Rahul had been blind, Tina had noticed the older Anjali's change of heart, and pitied her deeply. If Rahul hasn't remarried, perhaps his first love could be the mother that the young Anjali needs and wants.

Rahul has refused to remarry; he has thrown himself into his work with the intensity of desperation. Anjali Jr. believes that the older Anjali can make her beloved father happy again, and decides to help her father reclaim his lost paramour. She soon recruits her doting grandmother (Rahul's mother played by Farida Jalal) and grandfather (Tina's father played by Anupam Kher) as accomplices.

The unlikely conspirators locate Rahul's old flame and contrive to make Rahul and Anjali meet again. Rahul soon finds old feelings reviving. However, there is a complication. Anjali has bowed to her family's wishes and is engaged to another man, Aman (played by Salman Khan). Complications ensue, but all ends well as Aman steps aside to let the fated couple marry at last.