The spirit of the harvest moon appears one night, demanding that Courage and his owners leave since Eustace cannot seem to grow anything on their land. A sand whale arrives at the farmhouse and mistakes Eustace for his deceased father, Ickett, demanding the return of his accordion he swindled from him. Eustace tries to explain that his mother, Ma, has it but the sand whale does not believe him. The whale devours Muriel and Eustace and heads off. Courage must convince stubborn old Ma to give the whale back his accordion in order to win Muriel and Eustace back.