After beating off the rebellion, Macbeth, the hero of the hour is approached by three witches telling him: that he will become king, as will Banqou's son and Macbeth can only be killed by a man not born of Woman.
Upon hearing the news, king Duncan promotes Macbeth to "Thane of Cowdor".
Lady Macbeth convinces Macbeth to kill the King and rise like the witches predicted.
Macbeth becomes mad with power and paranoid about losing power, he kills many people including Banqou, his son, however, survives.
Macduff and the two sons off king Duncan plot to Kill Macbeth.