Macbeth encounters three witches who prophesy that he will become King of Scotland. Obsessed with the prophecy, Macbeth and his wife Lady Macbeth plan to kill King Duncan during his stay at their castle. They succeed in framing Duncan's chamberlains for the murder, and Macbeth becomes the new King. However, Banquo learns from the witches that his descendants will be kings, threatening Macbeth's reign. As a result, Macbeth arranges to have Banquo and his son murdered.