Teenage Mutant Ninja Turtles (1987): Season 4, Episode 31

4 - 31: Donatello's Degree

Donatello earns his degree from Sopho University, but discovers that he has been mistaken for a girl, so he asks Irma to masquerade as him. Meanwhile, the real Donatello discovers a plot by Professor Philo Sopho to destroy the Earth.