Horatio, Bernardo, and Marcellus see are frightened when they saw a ghost that has a strong resemblance to King Hamlet. Horatio tries to speak to the ghost but it disappears. Later, they agree to tell Prince Hamlet about the ghost in honor of their friendship.
King Claudius announces that he's going to marry Queen Gertrude, his dead brother's wife. He mentions young Fortinbras' attempt at revenge but quickly deals with the matter. Both the King and Queen are mad at Prince Hamlet because he's still mourning his father.
Hamlet does a monologue about how she's angry at his mother for marrying his uncle and how he's angry at his Uncle for everything he's done. Horatio, Marcellus, and Bernardo interrupt Hamlet to tell him about the ghost in the courtyard. The four of them agree to go to the courtyard again to try and catch the ghost.
Polonius gives his children advice. First with Laerates, telling him to keep his head down, never lend friends money, and to keep all his thoughts to himself. Polonius told Ophelia to not get too attached to Hamlet because he's a politican and he only loves her because it's what the people want.
Hamlet is mad because he thinks his uncle is making a mockery out of the kingdom. The ghost appears and he decides to follow it, though he is unsure if the ghost is a demon or his father. After a quick debate, Horatio and Marcellus decide to follow Hamlet.
Hamlet soon learns that the ghost is of his dead father, King Hamlet. He tells him how his uncle Claudius poisoned him. The king asks Hamlet to avenge him. Hamlet agrees and soon after the ghost disappears. Horatio and Marcellus meet Hamlet and he warns them that he's going to act very strange.