Joe Bell is a penny-pinching hermit saving for the day when his real life will begin. One day he's offered a chest filled with treasure by a crypt

　　回墨西哥拜訪家人時，這個寂寞的男孩認識了一隻躲在爺爺牧場的神祕生物，接著展開畢生難忘的冒險旅程。