Height Unseen is the first part of the ninth episode in season 4 of Dexter's Laboratory that first aired on September 12, 2003. It was, however, produced in 2002.
In this episode, Dexter is frustrated with being short and decides to make himself taller. After multiple failed attempts, he decides to make everyone else shorter than him through an experiment. Dexter boasts for a short period but realizes finally that it is okay to be short.