Act 1 of Shakespeare's Hamlet is an important act of the play because it sets the reader up with the mood of the play through conversations and events that happen. These moods set up are mysterious, mournful, and revengeful. With these moods set in place they will most likely determine the actions of Hamlet and other events that unfold throughout this tragedy.
Right away in the first scene and a few others you can see that there is a going to be a mysterious mood with a few weird things happening in during the rest of the play. In the beginning of the first scene Marcellus says, "Thus twice before, and jump at this dead hour, / With martial stalk hath he gone by our watch"(1,1,76-77). Marcellus is telling Horatio about the ghost that he and Barnardo have seen on a two occasions. They don't think that anyone will believe them so they bring Horatio along because if he sees it people will believe him because he is a scholar and he is respected. All three of the men tried to speak to the ghost but they are not successful, so a in Scene 4 they bring Hamlet along with them to see if he can talk to it because they said it looked like King Hamlet who had just been slain about two months ago. The ghost reveals that he is Hamlet's father and that Claudius killed him by being poisoned. This ghost and the scenes being set at night show that there are most likely going to be some mysterious events happening as the storyline unfolds.
Hamlet did not know how his father died before he saw the ghost but nevertheless was upset that he died and what made him more upset is that his mother remarried Claudius, who was his uncle, no more that a month later. As shown in the second scene you can see that Hamlet is still very upset about his father's death even though it has been two months since he died. In conversation between Hamlet, his mother and Claudius his mother says to Hamlet, "Good Hamlet, cast thy nighted color off, / And let thine eye look