Casper takes in a stray dog, who grows overnight.; When Buster starts to shrink when the Ghostly Trio scold him, Casper realizes that he grows or shrinks depending on how he is treated.; Casper finds a home for Buster, guarding the tiny Cellar People.; Nightmare meets a boy who is looking for adventure; they find themselves in Danger Land, but Nightmare gets them out.; When Casper falls asleep while riding Nightmare, she keeps him from falling off.; A troll tries to take Nightmare's tail.; Nightmare helps Gnorm move a log.