Rex and her best friend Pinky decide that they like each other enough to get married, and all their stuffed toys and dinosaurs appear as guests at the wedding.

Excited about holding onto his position as the best speller in the second grade, Pinky has an embarrassing accident but is cheered up by his best friend Rex.

Determined to be a good big sister, Rex starts spending all her time with the baby her family has adopted, making her neighbor Pinky fear that he has lost her friendship.

Pinky learns the importance of identity as he defends his favorite color, pink, and his friendship with a girl, Rex, from the neighborhood bully.

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.

It's time for Pinky's family to get a new pet. Pinky wants a dog, but his mother and father vote with Amanda and soon they will have a cat. But when Patches, as the cat is named, sneaks into Pinky's room each night, Pinky's feelings begin to change.