The story of Excalibur, the greatest sword in Third Earth history, is revealed to Mumm-Ra. Mumm-Ra determines to obtain Excalibur and to defeat Lion-O and the Sword of Omens. Mumm-Ra transforms himself into King Arthur and summons the Lady of the Lake. Mumm-Ra goes to the Cats' Lair and at first succeeds in persuading the Thundercats that he is a most powerful and honorable knight. The Thundercats become suspicious of Mumm-Ra/King Arthur because of his un-knightly behavior and arrogance. Mumm-Ra/King Arthur taunts Lion-O and maneuvers him into a joust. Excalibur and the Sword of Omens rip themselves free of their combatants and fight independently. But, having defeated the Sword of Omens, Excalibur refuses to obey the evil Mumm-Ra/King Arthur. Merlin appears and entrusts Excalibur to Lion-O, who returns it to the Lady of the Lake.

This episode can be found on

Disc 9

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