Three witches tell Macbeth he will be Thane of Cawdor then King of Scotland. After Duncan names Macbeth Thane of Cawdor, Macbeth and his wife Lady Macbeth plot to murder King Duncan. They kill Duncan at Macbeth's castle. Macbeth then has Banquo and his family killed to eliminate threats to his power. Macbeth is eventually killed in battle after Malcolm, Macduff and others plot to overthrow him.