Adventures of Sonic the Hedgehog Episode 49 - Hedgehog of the Hound Table Episode Title:Hedgehog of the Hound Table.Episode Description:Robotnik's next stop is the time of King Arfur and the Knights of the Round Table to get the Emerald of Invincibility. Sonic and Tails follow him, but Robotnik, with the unwilling help of local wizard Merlin, obtains the Emerald, magically petrifyies Sonic's feet and takes over the kingdom. After escaping and reversing the spell with Merlynx's help, Sonic challenges Robotnik to a jousting match. However, as Robotnik is now invincible, nothing Sonic tries is effective. Tails steals the Emerald while Robotnik is distracted, and Robotnik, Scratch, and Grounder are defeated and sent back in time to ancient Rome, where they are attacked by a lion in the Roman Coliseum.