The Play's the ThingMovie

Clifton Boyle, a lead actor in a disbanded theater troupe. Boyle returns home to find his sister dying; she reveals she married Harold Welles, another actor, who abandoned her and their deceased baby. Boyle swears vengeance on Welles. Boyle tracks Welles down and uses the theatrical world to enact his revenge, making a real-life drama out of his sister's tragedy.