A friendly, helpful fellow named Bert embarks on a series of adventures involving a troublesome shirt, a walking sausage, and a floating, barking cardboard box.
Chester, high off the success of his first book, decides he has no need for his illustrator, until she calls an open audition for a new, less self-absorbed feline to take Chester's place in the book.
Katie, an ordinary third-grader who accidentally wished on a shooting star to be anyone but herself, turns into her best friend Suzanne's baby sister, but the real trouble starts when she speaks, causing everyone to think the baby is a genius.
Franny is frustrated when her mother enrolls her in more and more activities that keep her away from her lab, and tries to come up with a solution that will make them both happy.
Tuffy the pet cat narrates his escapades as he attempts to escape his family's cat-sitter and suffers through a humiliating episode of mistaken identity.