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.

Pinky, Rex, and Amanda plot revenge on the bad-tempered old woman who lives across the street, until Pinky realizes that she is lonely and needs new friends.

Although his best friend Rex is excited about going to camp, Pinky is afraid of leaving home.

Pinky and Rex share a weekend with their fathers camping indoors due to rain.

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.

Pinky is jealous when his best friend Rex gets the lead in the school play, even though she only tried out to give Pinky moral support.