1. Captain Fortinbras: Hamlet meets Captain Fortinbras, who is leading an army of Norwegian soldiers. Fortinbras explains that he is on a mission to reclaim a strip of land that his father lost in battle to Hamlet's father, King Hamlet.
2. Horatio: Horatio, Hamlet's loyal friend, is present during this scene and observes the conversation between Hamlet and Fortinbras.
3. Gertrude: Hamlet's mother, Queen Gertrude, briefly appears in this scene. She arrives to inform Hamlet that King Claudius has sent him to England, along with Rosencrantz and Guildenstern, for his own safety.
4. Norwegian Messenger: A Norwegian messenger delivers a letter from King Fortinbras to King Claudius, requesting permission to pass through Denmark on his way to Poland.
Hamlet's interactions with these characters contribute to the overall plot development and highlight various themes and conflicts within the play.