Sonic and the Black Knight

A sorceress named Merlina, the granddaughter of the original Merlin, calls Sonic to her aid to free the mystical kingdom from King Arthur, who is possessed by an unknown evil that came from the scabbard of Excalibur and now rules the realm as a tyrannical Black Knight. Sonic's speed alone won't end the Black Knight's reign, so he must take the talking sword Caliburn to break Arthur's curse and save the kingdom. Sonic must also collect the blades from King Arthur's Knights of the Round Table and Excalibur itself if he wants to restore King Arthur's sanity and make him a benevolent ruler.