King Arthur is a character that appears in the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics. He is a tyrannical king from an alternate Zone who is served by a group of knights known as the Knights of the Round Table.
One day, the Royal Wizard Merlina did something that infuriated King Arthur and he chased after her on his flying horse. He summoned his Knights of the Underworld to help corner Merlina, but she used her magic to summon Sonic the Hedgehog to aid her. Sonic defeated all Arthur's Knights of the Underworld, but Merlina teleported herself and Sonic away just as the hedgehog tried attacking Arthur. King Arthur then met with Sirs Gawain, Lancelot and Percival, ordering them to find Merlina and Sonic and slay them while he gave chase.