Rex and her best friend Pinky, each the proud possessor of twenty-seven stuffed animals or dinosaurs, find their visit to the museum and its gift shop complicated by Pinky's little sister Amanda.
When Rex accompanies Pinky and his relatives on their traditional trip to pick and carve pumpkins, she feels left out because of the jealous behavior of Pinky's cousin Abby.
Rex and her best friend Pinky are upset to learn that their friend and neighbor Mrs. Morgan is moving, and it looks like a family with an obnoxious boy named Ollie is set to move in.