He is best known for playing the revered saint, Sai Baba of Shirdi, in the Hindi language historical drama series Sai Baba (TV series).
"[4][5] Mukul Nag is one of the best actors of National School of Drama, India.
His first play, Taimoor or Balak, was directed and acted by himself at the time when he was just 12 years old.
He then acted with Sagar Films in Shri Krishna as Sudama and Ashvatthama.
He also played the role of Prabal Gupta in the episode Sahi ka Kanta for Byomkesh Bakshi (TV series)[7] broadcast by Doordarshan in 1997.