The 1980s mythological epic series Mahabharat on Doordarshan featured many well-known actors, including Mukesh Khanna as Bhishma, Nitish Bhardwaj as Lord Krishna, Roopa Ganguly as Draupadi, and Puneet Issar as Duryodhana. But did you know that the actor who played the iconic role of Karna was first offered the role of Arjuna — which he refused because of one firm condition?