"Biopics of living, unsung heroes more challenging to make than those on well known heroes. Das was a super hero in many ways... His demonstration of patience in the face of political apathy, is a lesson that, unfortunately, might never be learnt by the younger generation," Mahadevan said in a statement.

Vinay Pathak will be seen as the freedom fighter, while Konkona Sen Sharma plays his wife. The cast also features Ranvir Shorey and Tannishtha Chatterjee.

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"The demeanor, discipline and resilience of Das were a revelation and it was a challenge to play Das not as an actor who copies a living character but as a flesh-n-blood character. Needless to say, the most satisfying exercise of my career so far as an actor," Pathak said.