Tails Prevails Adventures of Sonic the Hedgehog : Season 1 Episode 34

One of Tails' inventions catches the eye of the goofy Professor Dinglehopper, who asks the fox to leave Sonic and become his research assistant! While they travel to the professor's laboratory, the professor is captured and replaced by Robotnik, who gets the unwitting fox to help him to build his new anti-Sonic weapon! All is saved when Sonic accidentally shows up.