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The lead actor of the biographical drama "Shershaah," produced by Karan Johar, is Sidharth Malhotra. This movie celebrates the life and valor of Captain Vikram Batra, an Indian Army officer who showcased immense courage and leadership during the Kargil War. Through Malhotra's compelling portrayal, the audience experiences the sacrifices, struggles, and remarkable achievements of this real-life hero.