In this first full-length film based on the popular Nickelodeon cartoon series, Tommy Pickles (voiced by E.G. Daily) takes on additional responsibilities when a new baby brother enters the picture. The infant, named Dil, is such a burden to Tommy and his pals Chuckie, Angelica, Phil and Lil that they decide to bring him back to the hospital. The kids get lost along the way and run into a group of troublesome circus performers.