Harvey Swick is a fictional character from the short story "The Halloween Tree" by Ray Bradbury. He is a young boy who embarks on an adventure during Halloween night, exploring themes of friendship, courage, and the significance of life and death. Harvey's journey takes him through various historical and cultural experiences, highlighting the importance of understanding different traditions. In the story, Harvey is accompanied by his friends as they seek to rescue their missing companion, Mallow. Together, they encounter various supernatural elements and learn valuable lessons about the nature of mortality and the celebration of life. The narrative emphasizes the magic of Halloween and the deeper meanings behind its festivities.