Voir Adventures of Sonic the Hedgehog, Season 1, Vol. 2 - Episode 18

Part two in the four part series. Robotnik goes back to medieval times, and enlists the help of Merlink the Magician to get his magical gemstone. But first he must defeat Sonic (in blue armor) in a jousting tourney. Sonic is victorious, and is knighted by King Arfer (a dog) before he forces Robotnik into the future again.