Three witches gather to meet Macbeth and Banquo and make predictions about their future. They predict that Macbeth will be named Thane of Cawdor and King of Scotland and that Banquo’s descendants will be kings.
Macbeth’s wife receives a letter from Macbeth describing the witches' prophecies. He also says that King Duncan will be coming to visit. Lady Macbeth is ready to do whatever is necessary to ensure her husband being king.
He's a good man
Lady Macbeth comes up with a devious plan of getting the guards drunk while Macbeth kills the king and then blaming the crime on the guards.
You coward! Man up!
You amaze me
Duncan arrives inside the castle, welcomed by Lady Macbeth. They enter an area where the servants set a table for the evening feast.
Macbeth argues to himself against killing Duncan. He considers that Duncan is universally admired as a king and he has done no particular evil. Macbeth then tells his wife that he can no longer kill the king.
Lady Macbeth bursts in outrage. She calls him a coward and questions his manhood. She then tells him about her plan. Macbeth realizes that his wife never fails to astonish him with her brilliance. He then agrees to kill the king.