1 One witch wanted to have revenge
A lady refused to give one of the witches chestnuts. The witch decided to turn herself into a rat then go on the ship the woman's wife was sailing on to harm him.
2 Other witches offered help
The other witches offered help to the first witch. She thanked them and told them she is in control. The witch said that the man will suffer badly.
3 Macbeth arrived
Macbeth and Banquo arrived.
4 The witches started telling the future
The witches said that Macbeth will be the future king and that Banquo's descendants will be kings but he wont.
5 Macbeth was amazed
Macbeth wondered how could he become the thane of Cawdor or the King. before he got the answers the witches vanished.
6 Ross and Angus delivered the news to Macbeth
Ross and Angus arrived and told Macbeth that the king is so pleased of his deeds and that he named him the thane of Cawdor.
7 Banquo had doubts about the witches
Banquo had doubts about the intentions of the witches. He told Macbeth that they are evil and that they usually say a part of the truth to lure people into their destruction.
8 Macbeth got scary thoughts
Macbeth started getting bad thoughts that scared him such as killing the king to fulfill the prophecy.
9 Macbeth headed to the king
Macbeth joined the men and started heading to the king who wanted to meet him. See summary of act 1 - Scene 4.