Three witches tell Macbeth he will become Thane of Cawdor and then King of Scotland. When he is made Thane of Cawdor, he and his wife Lady Macbeth plot to kill King Duncan, who is staying at their castle. Lady Macbeth convinces Macbeth to murder Duncan, which he does. Macbeth then becomes King, but grows paranoid and has Banquo and his family killed. Macbeth continues to commit murders to hold onto his power but is eventually killed in battle by the forces of Malcolm, who becomes the new King.