The witches plan to meet up on the heath to confront Macbeth. As quickly as they appear, they disappear.
Macbeth and Banquo approach the witches and shriek at the sight of them. The witches hail Macbeth as Thane of Cawdor and Thane of Glamis. They also hail him as King hereafter. They tell Banquo that he will be lesser but greater than Macbeth, his sons will kings, and he will not be so happy but happier.
Lady Macbeth receives a letter from Macbeth and she reads it to herself. After reading it, she convinces her husband to do whatever it takes to become King.
Banquo mentions his dream about the 3 witches to Macbeth. He tells him that he would try to stay awake to stay away from the "cursed thoughts".
Macbeth sneaks into Duncan's chambers. He comes and finds Lady Macbeth and tells her "The deed is done". He hears servants praying and wishes that he had not killed Duncan. He wishes that Duncan will wake up.
Macduff finds Duncan's dead body and tells everyone that Duncan is dead. Malcolm goes to England and Donaldbain goes to Ireland for safety. Macbeth seizes the crown.