Om Prakash Makhija (Shahrukh Khan) is a junior artist aspiring to become a superstar one day and live life of luxury and comfort. He is a die-hard fan and a secret lover of popular actress Shanti Priya (Deepika Padukone). His mother and Papu (Shreyas Talpade) are the only true believers of his talent. A fire accident on one of the shooting sets introduces Shanti to Om. As Om finds happiness and satisfaction he finds out an untold truth of Shanti being married to film producer Mukesh Mehra (Arjun Rampal) who kills her after she admits her pregnancy to him. As a witness to this crime, Om gets killed in a fight with Mehra's men.
Om Prakash comes back to the world now as Om Kapoor, a star-kid. Om Kapoor is all set to take revenge on Mehra for killing his love Shanti. He plans a conspiracy with Shanti's clone Sandy, his mother and friend Papu to make Mehra (who is now a big producer in Hollywood) confess about his deadly crime. Will the purpose of Om's rebirth be fulfilled? Will Mukesh Mehra confess his crime? What is the future of Om and Sandy?