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King Arthur is the most powerful and effective guises assumed by Mumm-Ra, the devil priest’s interpretation of fabled hero King Arthur is very much a distortion of the legendary original – ruthless, manipulative, cold, calculating and evil to the core, Mumm-Ra’s Arthur is everything the original was not. Nevertheless, Mumm-Ra’s King Arthur guise appears to possess all the physical strengths and skills of the original and even wields the mighty sword Excalibur, marking King Arthur as one of the ThunderCats’ deadliest foes.