| Director | Arend Steenbergen, Farhan Akhtar |
|---|---|
| Budget | ₹38 crore |
| Box office | ₹106.3 crore |
The illegal drug trade based in Kuala Lumpur, Malaysia, is booming. A team headed by DCP D'Silva targets the operations of cartel leader Singhania to capture his manager, Don. Singhania is one of the two lieutenants of a deceased kingpin, known as Boris; the other is Vardhaan, whose whereabouts are unknown.
Don kills Ramesh, one of his close associates, after he tries to leave the gang without informing him first. Ramesh's fiancée Kamini uses herself as bait in an attempt to trap him for the police, but Don kills her too in a standoff. Roma, Ramesh's sister, plans to avenge her brother and sister-in-law's deaths and infiltrates Don's gang. Don is injured and falls into a coma while trying to flee from the police. D'Silva finds a lookalike named Vijay and asks him to join his mission. Vijay, a poor man, agrees when D'Silva promises to admit Deepu, a boy Vijay takes care of, to school.
Meanwhile, Jasjit, an IT consultant and Deepu's father, is released from prison. He plans to kill D'Silva to avenge his wife's death. Some years ago, Jasjit was captured by an unknown assailant who made him steal diamonds from his employer in order to save his kidnapped wife. However, D'Silva caught him and refused to believe Jasjit, shooting him in the leg and giving him a permanent limp. Jasjit's wife was killed afterwards.
At the hospital, a doctor gives Vijay scars identical to Don's. When Don dies, the masquerade begins. While Don's dead body is sent to Malaysian security, Vijay poses an amnesiac Don and joins the gang. D'Silva asks Vijay to find a computer disc containing details about the drug cartel. When Vijay finds it, Roma attempts to kill him, but D’Silva tells her of Don's real identity. Vijay hands over the disc to D'Silva, who murders Singhania during a raid at a club. The police also arrest Vijay. D'Silva is killed in the shootout, devastating Vijay, as he was the only person who could prove that the latter is not the real Don. Having discovered Vijay's true identity, Don's associates turn against him. Vijay escapes a prisoner transportation flight to Malaysia and meets with Roma to recover the disc and prove his innocence.
Jasjit finds the disc in D'Silva's apartment. He receives a call to bring the disc to the men who are holding Deepu hostage. He learns that D'Silva had faked his death and is actually Vardhaan (who is also implied to have been the man who blackmailed Jasjit), and was using Vijay to reach Singhania and take over the cartel. Jasjit escapes with Deepu and teams up with Vijay and Roma before the trio informs Interpol.
In combat, Vijay overpowers Vardhaan, who is then arrested by Interpol officer Malik. A wounded Vijay is acquitted, and Roma confesses her love for him. Before he is taken to the hospital, Vijay reciprocates her feelings. However, Roma realizes too late, in a twist ending, that she was being played after “Vijay” says a line that Don once said to her when they first met - Don is actually alive and was pretending to be Vijay all along, having survived the chase and his encounter with Vardhaan. At the hospital, Don recovered from his coma early and overheard Vardhaan and Vijay's plans. Following Vijay's operation, Don switched places with him and injected diazepam into Vijay's intravenous line, killing him and making the doctors believe it was Don who had died. The disc Don surrendered to the police was a fake one. Now, with both Vardhaan and Singhania removed, Don becomes the kingpin of the Asian drug cartel.