Dudley uses Keswick's growing formula to make himself tall, but he ends up destroying Petropolis and is being sent away. Bird Brain also uses the formula to destroy the rest of the city and "everything that flies". Now, Dudley is the only one who is able to defeat him. / Bird Brain steals eggs from the delivery ward of a hospital to hatch them with his evil incubator, thus getting a new army. Dudley and Kitty go undercover as both a doctor and a nurse to discover who is committing the crime. Meanwhile, Keswick poses as the chief of T.U.F.F. due to The Chief being in Dudley's nose for two weeks, and considered retired.