Voir Adventures of Sonic the Hedgehog, Season 1, Vol. 2 - Episode 20

Number four in the four part series. Robotnik learns that the most powerful gemstone -- able to create life itself -- is located in Prehistoric Times. So off he goes again, followed by Sonic and Tails. When he arrives, Robotnik turns dinosaurs into robosaurs, and Sonic has to lead the Cave dwellers in a "football team" defense of the gemstone located at the top of a volcano. In the end Robotnik fails again, and Sonic boots him back to the future, then destroys the time machine once and for all.