Watch ThunderCats (2011) Season 1 Episode 21 - Birth of the Blades

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ThunderCats (2011) Season 1 Episode 21
Mumm-Ra arrives at Mount Plun-Darr and battles the Thundercats in an attempt to regain the Sword of Plun-Darr.
First Aired: May 12, 2012
Will Friedle, Pamela Adlon, Dee Bradley Baker, Robin Atkin Downes, Pamela Adlon, Jason Marsden, Cree Summer

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ThunderCats (2011), Season 1 Episode 21, is currently available to watch and stream on Cartoon Network. You can also buy, rent ThunderCats (2011) on demand at iTunes online.