After the passing away of his dark-skinned wife, from who they sired Uday [Nana Patekar], Dubai-based criminal don, Shankar Shetty re-married a fair-skinned woman, who gave birth to fair-skinned Sanjana [Katrina Kaif]. After the couples passing, Uday takes over in his dads footsteps, and takes it upon himself to try and get Sanjana married - in vain, as no one wants to be associated with a crime family. Then Udays associate and brother, Sagar Pandey [Anil Kapoor], aspiring live-action painter, who had loved Iravati, got beat-up by her brothers, and was re-named Majnu, assists in finding a young man, Rajiv [Akshay Kumar], who lives with his maternal uncle, Dr. Ghunghroo [Paresh Rawal] and aunt, and through extortion compels Ghunghroo to accept this alliance. But Ghunghroo, at the very first opportunity, gets Rajiv to fall in love with another young woman in Sun City, South Africa. When the time comes to get Rajiv formally engaged to this woman, he finds out that Sanjana and she are the very same woman. With no escape from this predicament, the wedding is planned, invitations are sent out, and even Ranvir Dhanraj alias RDX [Feroz Khan], an Italian-based criminal don, also makes an appearance. On the day of the engagement, a woman named Ishika [Malika Sherawat] claiming to be Rajivs child-hood betrothed shows up, makes a successful plea to Ranvir, and gets the engagement annulled. When Dr. Ghunghroo finds out that Rajiv and Sanjana have fallen in love with each other, he decides to accept Sanjana into the family on the condition that Uday gives up on crime. Rajiv and Sanjana attempt to get Uday to take up acting in a Bollywood movie - with considerable success - so much so that Uday has no time for crime. That does not help so Rajiv and Sanjana think it would be better if Uday knows real Actors, so they get Suniel Shetty and Asrani to star in the movie, but when the Film Director talks rudely with Sunil Shetty, he quits the film and tells Asrani to quit to. After they leave the movie, Things get complicated when Ranvirs son, Lucky, gets wind of Rajivs scheme and arrives in India with one mission - get Uday back on track with crime - and if necessary do away with Rajiv - once and for all.

Soundtrack

The song listing is as follows.

Song	Singer[s]	Music Director
Hoth Rasiley	Shankar Mahadevan, Anand Raj Anand, Shreya Ghosal	Anand Raj Anand and Aadesh Shrivastava
Insha Allah	Krishna, Shaan, Akruti Kakkar, Himesh Reshammiya	Himesh Reshammiya
Kola Laka Vellari	Himesh Reshammiya	Himesh Reshammiya
Kiya Kiya	Anand Raj Anand, Shweta Pandit	Anand Raj Anand
Uncha Lamba Kad	Anand Raj Anand, Kalpana	Anand Raj Anand
Welcome	Shaan, Sowmya Raoh, Wajid	Sajid-Wajid

Box office

According to boxofficeindia.com, Welcome opened to a massive response locally, it grossed Rs. 353 million in its first week, which exceeded Dhoom 2s opening, and came only fourth to Races Rs. 356 million, Om Shanti Oms Rs. 401 million and Singh Is Kinngs all time high Rs. 431 million opening. Within two weeks, Welcome grossed around Rs. 76 crores, despite facing competition from the highly successful, Aamir Khans Taare Zameen Par and was declared a blockbuster. Welcome became the second highest grossing film of 2007, just behind Om Shanti Om.

Trivia

*Nana Patekar and Anil Kapoor were reunited after a 18 year gap when both actors were seen in Parinda. * This is one of five films that Akshay Kumar and Katrina Kaif have starred in. Film producers and directors are keen on having this on-screen "jodi" since they have produced hits every time they are together. * This film is somewhat similar to the American film "Mickey Blue Eyes" starring Hugh Grant. * This is the last film that Feroz Khan starred in before he died in 2009. * When Feroz Khans character is seen for the first time, he is introduced by an remixed instrumental of the song "Laila O Laila", from the film Qurbani, in which he starred in.