

Kumar reprised the role played by Thengai Srinivasan in Yehi Hai Zindagi which was a remake of Kaliyuga Kannan. Navarathri was remade as Naya Din Naya Raat. The film Khilona and its Tamil version Engirundho Vandhaal were made simultaneously. It was these Hindi film remakes which elevated him to a great actor. The producers and Directors of the South wanted to remake their Tamil and Telugu films in Hindi with either Kumar or Rajesh Khanna in lead. Hrishikesh Mukherjee directed him in Arjun Pandit, for which he won the Filmfare Best Actor Award.

He performed in nine movies directed by Gulzar. In 1973, he made a guest appearance during a song in a Tamil movie, Bharatha Vilas (1973). He went on to star in the box office hits Seeta Aur Geeta (1972), Manchali (1973) and Aap Ki Kasam (1974). Kumar won the BFJA Awards for Best Actor (Hindi) for his exemplary portrayal of a deaf and mute person in Koshish, in which the female lead was played by Jaya Bhaduri, who acted as his deaf and mute wife and was herself nominated for Best Actor award by Filmfare for the same role. Gulzar casted Kumar in role of young man in the films Angoor (1981) and Namkeen (1982). Later he cast Kumar in the roles of older men in 4 films Parichay, Koshish (1973), Aandhi (1975) and Mausam (1975). This was when Director Gulzar first spotted him. In 1972, he played in an Indo-Iranian film, Subah aur Shaam. In 1970, the movie Khilona, which was remake of Tamil film Engerindho Vandhaal, brought Kumar national recognition.
