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Wild Bill Wharton, played by Sam Rockwell in The Green Mile, is a sadistic and cruel prison guard who takes pleasure in tormenting the inmates on death row. His heartless nature and lack of empathy make him a despicable character, contrasting sharply with the compassionate and empathetic protagonist, Paul Edgecomb. Rockwell's portrayal of Wharton effectively captures the character's malevolence and adds depth to the film's exploration of morality and redemption.