Teenage Mutant Ninja Turtles: Donatello's Degree(1991)

After scoring tops in his correspondence school class, whiz kid Donatello is invited to receive his degree in person--er, in turtle. But at Sopho University, he and Irma run afoul of the seriously bogus Professor Sopho, who plans to use a giant magneto-oscillator to speed up the Earth's rotation and make himself Supreme Ruler! Now, only Donatello and his hard-punchin' pals can keep the planet from being plunged into a dangerously gnarly spin cycle!