Birth of the Blades is the twenty first episode of ThunderCats (2011 TV series).


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

A flashback shows when Mumm-Ra first had the Sword of Plun-Darr forged, having to destroy a star to do so, and killing billions of intelligent people in the process.



  • Pumyra finally disregards her grudge against Lion-O after he saves her life numerous times.
  • Although they appear in this episode, neither Cheetara nor Tygra have any lines.


  • Kaynar: Ah-ah-ah. That sword doesn't belong to you.

Lion-O: Maybe not. (draws the Sword of Omens) But this one does!

  • Mumm-Ra: Your ancestor thought he could beat me as well, I'm still here, where is he?

Lion-O: You're looking at him!


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