Rumbling Thunder sets the mood for the opening of the show.
Three figures emerge from the shadows. They are three Witches – or Weird Sisters – foretellers of the future (The Opening). They look forward to meeting Macbeth.
At King Duncan’s camp near Forres, a wounded sergeant tells of Macbeth’s heroics in battles against Macdonald and the rebels, while Ross reports that King Sweno of Norway and the traitorous Thane of Cawdor have also been defeated by Macbeth. The witches wait on the Blasted Heath (Weird Sisters), and meet up with Macbeth and a fellow warrior, Banquo, as they return to Duncan’s camp. They hail Macbeth and Banquo with three prophecies, then disappear into the air. Macbeth is already Thane of Glamis (the first prophecy) and is astonished when he is suddenly made Thane of Cawdor (the second) and wonders whether he will soon be King (the third). At the Royal Palace at Forres, Macbeth hears the announcement that Prince Malcolm, Duncan’s eldest son, will be heir to the throne.
If his ambition to become king is achieved, Macbeth realizes that at least two people must now die. He sends his wife the news in a letter. As she reads it she is told that the King is to visit Macbeth’s castle, and develops a plan to murder him(Better Leave It Up to Me). She summons up help from evil spirits to make her strong like a man. Macbeth returns and decides that he doesn’t want to go through with his wife’s plot to murder the King after all (How Do You Murder a King?)She changes his mind.
As he prepares to commit the murder, he imagines he sees a dagger before his eyes. He kills the King but forgets to leave the guards’ daggers at the scene as planned. Lady Macbeth takes them herself, and smears blood on the guards’ faces to make it appear that they did the deed.
The Porter – somewhat hungover from the previous night’s reveling – talks about “equivocators” (Knock! Knock! Knock!), and eventually answers the knocking at the castle