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Episode Number :21

Rate : imdb 8.4/10

RunTime :22 mins

Air Date :2012-05-12

Story : Mumm-Ra arrives at Mount Plun-Darr and battles the Thundercats in an attempt to regain the Sword of Plun-Darr.

Season 1 Episodes :

Will FriedleLion-O (voice)

Kevin Michael RichardsonPanthro / Ancient Spirits of Evil (voice)

Robin Atkin DownesMumm-Ra / Addicus (voice)

Dee Bradley BakerSlithe / Kaynar / Rat (voice)

Pamela AdlonPumyra (voice)

Cree SummerPanthera (voice)

Jason MarsdenLeo (voice)