A short-term memory loss patient sets out on his journey to avenge the death of his beloved girl.
Ghajini is a 2008 Indian Hindi-language action thriller film written and directed by A. R. Murugadoss, jointly produced by Allu Aravind, Tagore Madhu and Madhu Mantena. 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. 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.
The score and soundtrack were composed by A. R. Rahman, while Aamir co-wrote an altered climax. 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. 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.
SYNOPSIS GHAJINI
Sunita, a medical student, is investigating the anterograde amnesia case of Sanjay Singhania, the chairman of Air Voice, a telecommunications company. She does so against her professor Dr. Debkumar Mitra's wishes, in spite of Sanjay being under criminal investigation. 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.

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. He learns that Sanjay, a successful entrepreneur, met Kalpana, a struggling model, after he planned on installing an advertising billboard above her apartment. 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. Kalpana also decides to pose as Sanjay's girlfriend.
As soon as Sanjay finds out about the false rumor, he plans to meet Kalpana to confront her but fails, as he starts to like her after seeing her altruistic nature. He poses as Sachin Chauhan, a newcomer model, and lies to Kalpana about himself. Soon, he falls deeper in love with her. At the end of the first diary, on 31st December, Sanjay, still playing Sachin, proposes to Kalpana who, taken aback by such a sudden gesture, asks for the night to think over it. He decides that if she would agree, then he would reveal his true identity to her, but, if not, then he would quietly walk away from her life as Sachin.
As Arjun starts reading the second diary, Sanjay attacks him and ties him up. Sunita locates the apartment, finding Arjun and learning of Sanjay's murder plot. She steals his diaries and frees Arjun. As she and Arjun escape, Arjun is hit by a bus. Sunita then informs Ghajini about the fact that Sanjay is coming to him to kill him. Sanjay finds out about this and goes to attack her at her dormitory, where he is arrested and given a sedative. Ghajini is informed by the police about Sanjay's belongings and he poses as Sanjay's friend. Soon Sanjay's employees and doctor arrive and take him home. There, Ghajini and his men destroy his pictures and cover his tattoos, thus leaving him with no memory about the past.

After Sanjay gets arrested, Sunita reads the diaries. She finds out about Kalpana. In the second diary, Kalpana accepts the proposal, but on the condition that she marry only after she purchases three ambassador cars, due to a past commitment. One thing leads to another and Sanjay decides on taking her the truth about himself later. The diary ends abruptly when Sanjay has to go overseas for a few days.
After some research, Sunita eventually learns Kalpana travelled to Goa, where she stumbled across and freed a group of girls from a sex trafficking ring orchestrated by Ghajini. Sanjay returns home and finds Kalpana stabbed. Ghajini hits Sanjay in the head with an iron rod which results in brain injury, before killing Kalpana with the same rod, in front of him. Feeling guilty of doubting him, Sunita reminds Sanjay of Kalpana's murder and helps him track Ghajini to his local area. Sanjay then kills his men but has a memory loss fit while searching for Ghajini, who takes advantage of the situation and stabs Sanjay. As he prepares to kill Sunita the same way he killed Kalpana, Sanjay recovers his memory and kills Ghajini with the iron rod.
Six months later, Sanjay returns as the chairman of Air Voice and is volunteering at an orphanage named after Kalpana, helping everyone like she did, and trying to heal. Sunita gifts him the cement pad with Sanjay and Kalpana's foot impressions and he feels Kalpana beside him, as the screen pans out in a fading sunset.
CAST
- Aamir Khan as Sanjay Singhania / Sachin Chauhan, a rich businessman; the chairman of a mobile phone company, Air Voice; who later suffers from short-term memory loss after a tragic incident caused by Ghajini, being solely motivated, thus, to kill him and his cohorts
- Asin as Kalpana Shetty, a model who gains publicity by falsely proclaiming herself to be the girlfriend of Sanjay Singhania, but soon becomes his love interest, later getting killed by Ghajini
- Khalid Siddiqui as Pankaj Shroff, Sanjay's private assistant and an Air Voice manager
- Jiah Khan as Sunita, a medical student, who tries to study the case of Sanjay Singhania and his amnesiac problem, even though she is forbidden to do so
- Pradeep Rawat as Ghajini Dharmatma, a gang honcho and the mastermind of many illegal and criminal ventures who is targeted by Sanjay
- Riyaz Khan as Inspector Arjun Yadav, a police inspector who is investigating the murders Sanjay committed (voiceover by Rajesh Khattar)

- Tinnu Anand as Satveer Kohli, Kalpana's boss
- Sai Tamhankar as Sunita's friend
- Supreeth Reddy as Ghajini's Henchman
- Vibha Chibber as Havaldar Vijyanti
- Sunil Grover as Sampat, a model who is being trained as the fake Sanjay Singhania
- Rajendran as Ghajini's henchman
- Firdausi Jussawalla as Dr. Peston Wadia
- Rahul Pendkalkar as Rahul (cameo)
- Diya Sonecha as Pooja (cameo)
- Sonal Sehgal as ad model
- Anjum Rajabali in a cameo appearance as Dr. Debkumar Mitra, Sunita's professor