When the play first opens we hear 3 strange witches standing in a field while it is thunder and lightening. They begin to chant spells and talk about their meeting with Macbeth as they vanish into thin air.
Not to far from the field, there is a battle taking place, the King of Scotland is there with some of his followers. The king is much to old to fight for himself, so he sends to hear how his army is doing. A badly injured soldier then returns from battle to tell Duncan how dreadfully bloody it is but how Macbeth saved the day by fighting and killing many of the rebels and their leader.
The Thane of Ross soon arrives bringing more news about the Thane of Cawdor; he claims he is a traitor. Once Duncan learns that he has won the battle, he orders that the Thane of Cawdor be executed and killed leaving Macbeth to take over his place.
Before Duncan had the time to reach Macbeth with the good news, the three witches approach him and Banquo. The greet Macbeth with three different titles: Thane of Glamis, Thane of Cawdor and King Hereafter, but this confuses Macbeth. Not only do the witches tell Macbeth his future, they also tell Banquo that although he will never be King, his children will be and then they vanish once again.
As Banquo and Macbeth joke about the predictions, Duncan's messengers interrupt them and tell Macbeth that he is now the Thane of Cawdor, he is no longer laughing about the witches and their predictions. Duncan also announces that his son, Malcolm, will inherit the throne, but his reaction was unexpected. At the same time, Lady Macbeth is at the castle reading a leader from her husband telling her about the witches, she's willing to do anything to make Macbeth King. When she hears that Duncan will be spending a might at the castle she sees it as the perfect night to murder him.
At the end of act 1, we find Macbeth in his room debating about whether or not he should kill Duncan. He seems to have many arguments...