Vinod Khanna and Amitabh Bachchan entered Bollywood in the late 1960s during Rajesh Khanna's reign. As Amitabh rose with hits like Zanjeer, Vinod gained prominence through villainous roles. Their rivalry became apparent in films like Zameer and Hera Pheri, while their partnership thrived until Vinod decided to join Rajneesh’s ashram.