
Kalpana also decides to pose as Sanjay's girlfriend. When his agents arrive at Kalpana's shooting site to negotiate with her about it, Kalpana's boss, advertising veteran Satveer Kohli, misinterprets this as a romantic advance and, in a view of fame and fortune, encourages Kalpana to accept the overture. He learns that Sanjay, a successful entrepreneur, met Kalpana, a struggling model, after he planned on installing an advertising billboard above her apartment. Police officer Arjun Yadav, who is investigating a murder that Sanjay committed, knocks Sanjay unconscious in a scuffle at his apartment and finds two diaries in his drawer. Sanjay, who loses his memory every 15 minutes, uses a system of photographs, notes, and tattoos on his body to recover his memory and remember his mission of avenging the murder of his fiancé Kalpana Shetty, who was killed by a criminal kingpin, Ghajini Dharmatma. Debkumar Mitra's wishes, in spite of Sanjay being under criminal investigation. Sunita, a medical student, is investigating the anterograde amnesia case of Sanjay Singhania, the chairman of Air Voice, a telecommunications company. Suriya, who played the protagonist in the Tamil original, lauded the film and found it an overall better version. Aamir's character was featured in a 3D video game titled Ghajini – The Game, which is based on the film. It went on to become the highest-grossing Indian film of all time, until it was surpassed by Aamir's next, 3 idiots (2009), the following year and then by Shah Rukh Khan's Chennai Express (2013).

Ghajini's paid preview collections were ₹ 27 million. Released theatrically on 25 December 2008, Ghajini became the highest-grossing Indian film of the year, and the first Bollywood film to cross the ₹100 crore mark domestically, creating the 100 Crore Club.

In the film, a businessman suffering from anterograde amnesia sets out to avenge his girlfriend with the aid of photographs from a Polaroid Instant camera and permanent tattoos on his body. Murugadoss, had written half of the film's story when he watched Memento, and claimed to merely use the character due to his short term memory loss condition. Rahman, while Aamir co-wrote an altered climax. The score and soundtrack were composed by A. It stars Aamir Khan, Asin reprising her original role in her Hindi film debut, Jiah Khan and Pradeep Rawat, co-starring Tinnu Anand, Sunil Grover, Khalid Siddiqui and Riyaz Khan.

A remake of Murugadoss's own 2005 Tamil film of the same name which in turn is inspired by the 2000 film Memento and 1951 British film Happy Go Lovely. Murugadoss, jointly produced by Allu Aravind, Tagore Madhu and Madhu Mantena. Ghajini is a 2008 Indian Hindi-language action thriller film written and directed by A.
