Mumm-Ra wants to reclaim the sword of Plun-Darr.
Previously on Thundercats Season 1 Episode 20 "Curse of Ratilla", The ThunderCats must infiltrate the mines of Mount Plundarr where Ratar-O is holding Cats as slaves. There they learn the legend of the Sword of Plundarr, which they must now retrieve while also freeing their people.
On this week's Episode title "Birth of the Blades", Mumm-Ra wants to reclaim the sword of Plun-Darr.
ThunderCats is an American/Japanese animated television series executive produced by Sam Register, and produced by Ethan Spaulding and Michael Jelenic and is a reboot of the original series by Tobin "Ted" Wolf. It is produced by Warner Bros. Animation with animation provided by the Japanese Studio 4°C.
The series began with an hour-long premiere on Cartoon Network on July 29, 2011. The show started airing on 10 September 2011 in the United Kingdom.