The Shakespeare play that features the character Iago is "Othello." Iago is known for being one of Shakespeare’s most notorious villains, characterized by his manipulation, jealousy, and deceitful nature. He seeks revenge against Othello, a Moorish general, by plotting to ruin his marriage to Desdemona through cunning schemes and lies. The play explores themes of betrayal, obsession, and the destructive power of jealousy, highlighting the tragic consequences of Iago’s actions and the moral ambiguities of human nature.