Penn won for his performance as Col. Lockjaw in "One Battle After Another,", a corrupt military officer who hunts down a revolutionary group while trying to silence a secret from his past so he can join the Christmas Adventurers Club.
The actor is no stranger to Oscar glory, having previously won for "Milk" and "Mystic River" and been nominated for "Dead Man Walking," "I Am Sam" and "Sweet and Lowdown."
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