Amitabh was the fifth choice after Dev Anand, Raj Kumar, Dharmendra and Rajesh Khanna. Dev wanted the actor to be allowed to sing a couple of songs; and asked Prakash to direct under Navketan. Dharmendra could not fit into schedule. Rajesh feared the role might tell upon his romantic image. It was Pran who suggested Mehra to see "Bombay to Goa", and in particular the young hero. The film had a fight scene and the moment Prakash saw the fight scene, he screamed "Mil Gaya".