The film released to Indian audiences on 24 July 2009.
Luck is the story of gambling kingpin Karim Musa (Sanjay Dutt), who is a very lucky person seeing the story of his life. He remained the sole survivor when a mosque collapsed in Maharashtra when he was just a child of nine months and was amongst very few survivors of another incident at the age of 12. When he was 14, he challenged three friends to jump from a four-storied building and remained alive, though with some injuries, and won. He started gambling at 19 and since then tried out his luck in different places of the world and became known as Musa Bhai. To him gambling and drug smuggling have become old ways to get money, his latest interest is investment on people's luck.
Ram Mehra (Imran Khan), is abducted by Lakhan Tamang (Danny Denzongpa), but instead of taking, he gives Ram hundred thousand rupees and explains that Ram is very lucky as Tamang bought lottery tickets for two years without any success until he took tickets from Ram both of which won him two hundred thousand rupees. He then offers Ram 200 million rupees for which Ram has to gamble with him for 20 days. After Ram agrees, Musa Bhai and Tamang create a game, getting people with luck to play, and the luckiest ones win them money.
Later, along with Ram, Tamang hires (Mithun Chakrabarty), who is a soldier as lucky one as he fought inTamang battles and faced numerous bullets none that could kill him. He is in need of money for the operation of his wife Sheila (Roopa Ganguly). Tamang then visits Pakistan where Shortcut (Chitrashi Rawat), a 16-year-old girl, who is also known to be lucky as any camel she rides wins the race and observes her winning one despite her camel's half-broken leg. Tamang pays four lakh rupees to "export" her to South Africa. Tamang then invites the sole-criminal, Raghav Raghuvaran (Ravi Kishan) to the game. Raghav was put in Tihar Jail for raping many women, and also killing them, but when he was hanged, he survived, and since the Indian law doesn't allow one person to be hanged twice, he frees from Tihar Jail.
All competitors arrive in Cape Town. There, Ram meets a girl (Shruti Haasan). Her name is revealed to be Ayesha and Tamang says she took part in the game once before. In their first game, all competitors shoot the person to their right at the same time. All the unlucky ones die, though the lucky ones survive. Later that night, while everyone is eating at a dining table, Raghav goes to Ayesha's room, and starts flirting with her, though Ayesha pays no attention and leaves. The second game is where all of the investments take parachutes and jump off from a helicopter.Some parachutes open while others don't. Among the unlucky is Ayesha whose parachute doesn't open but she is saved by Ram, who developed a liking towards her, and afterwards, they start getting closer. In the third game, everyone is left in a hollow tank with one of everyone's hand locked with handcuffs and in front of them are 300 keys and one each will open the handcuffs and added to their trouble are the sharks that swim around them as they start opening the handcuffs as the tank sinks. Only one dies, but Shortcut is attacked by a shark. The shark bites her leg, but since Ram can't bear to see it, he jumps into the water, and saves the harmed Shortcut (who is then taken to the hospital). Later on, it is revealed that due to her leg, Shortcut will not be taking part in any of the games any more.
Before the fourth and final game, Raghav tries to kill Ayesha, who then runs away to Musa and Tamang, where it is revealed that Ayesha is dead and it is Natasha (her twin-sister) playing, taking Ayesha's character whilst seeking revenge on Musa, for her sister's death. Though Musa finds out about this, and uses her for the game. In the final game, Ram, on whom the bid is the highest ever, has to save Natasha before the train she's tied to hits an oil tanker while Major Singh will help him and Raghav will shoot at Ram and the other survivors try to stop Ram. On the train, Ram starts to fight Raghav, but once Raghav is knocked out on the floor, Ram goes to save Natasha, but Raghav gets up, then interrupted by Major Singh, who to save Natasha and Ram, jumps onto Raghav. However, Raghav pushes Major Singh down to the back of the train, which later explodes. Raghav then goes to Ram, who is currently untying Natasha's hands, though Raghav attacks Ram from the back, but when the oil tank reaches right in front of the train, Ram and Natasha jump off, and Raghav dies. When Ram and Natasha realise what has happened, before they lose hope, Major Singh is seen on the floor getting up, who explains that he jumped off the train a second before his side of the train exploded. The three survivors are then approached by Musa and Tamang, who claim that they won the game and claim two hundred million rupees each.
In the climax, Ram stakes his reward and challenges Musa to a game where two pistols are dug in coal the train's carrying and one has to find one and shoot the other. Musa finds both but hands one to Ram and both shoot at the same time and hit each other, Ram is shot at the place of his heart and Musa survives as he is hit at his shoulder. Though, it is shown that Ram's heart is at his right side (dextrocardia), very rare for a human, rather than left and eventually wins back his reward. Then, Shortcut's leg is fixed by a prosthesis, Major Singh saves his wife and maintains his title "Lucky Major Jawar Pratap Singh" and Ram and Natasha get married.Imran Khan as Ram Mehra
Shruti Haasan as Ayesha / Natasha
Mithun Chakraborty as Major Jawar Pratap Singh
Sanjay Dutt as Karim Musa
Danny Denzongpa as Lakhan Tamang
Ravi Kishan as Raghav Raghuvaran
Rati Agnihotri as Mrs. Mehra (Ram's Mother)
Chitrashi Rawat as Shortcut
Smita Mahey as Angela (Introducing)
Snehal Dabi as Jiten
Daya Shankar Pandey as Passport Agent
Roopa Ganguly as Sheila Singh (Major Jawar Pratap Singh's wife)
Kota Srinivasa Rao as Swami
The soundtrack album has nine songs, eight composed by duo Salim-Sulaiman and one by guest composer Hamza Mirza. The lyrics are primarily penned by Shabbir Ahmed and Anvita Dutt Guptan. The audio of the film released nationwide on 28 June 2009, a month prior to the release. The album, notably features a song sung entirely by the lead actress Shruti Haasan who made her debut with the film.
Luck was released worldwide on 1,110 prints in 1300 screens. In India, it was released on 976 prints (343 physical prints and 633 digital prints) in 1,150 screens and in 134 prints on 150 screens in overseas. The action-thriller Luck fetched a very good start at single screens of most circuits. The 12 noon shows in U.P., Punjab, Bihar, Rajasthan, Gujarat and Maharashtra were in the 70% – 80% range. But the 3 pm shows were almost houseful everywhere. The opening at multiplexes, however, was around 40%. Mumbai was affected due to the high tide scare on Friday but soon rose up on Saturday and Sunday. Meanwhile, the film collected DHS280,000 on its opening day in UAE.
In 4 weeks, the film collected ₹325,800,000 (US$5.1 million) in India, meanwhile collecting ₹16,394,500 (US$260,000) in the UK and ₹14,933,300 (US$230,000) in United States.