Petey Porcupine lives in the White Mountains and dreams of seeing a baseball game at Fenway Park. When his friend Hawk returns from a game with a Red Sox pennant and describes the excitement of the game-winning home run, Petey vows to make his wish come true. With the help of trees that fly him out of the forest and two children who carry him on a "creature with one hundred," Petey amazes the people of Boston.