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Birth of the Blades

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Birth of the Blades
Original Airdate May 12, 2012
Episode Number 21
Season 1
Animation Company Warner Bros. Animation and Studio 4 C

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. Leo took the leftover pieces and, in secret, had the Sword of Omens forged.


  • 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!




  • 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.

Thundercat signal "Then let's get to work here!"
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Previous episode:
"Curse of Ratilla"
ThunderCats 2011 Season Guide
Next episode:
"The Forever Bag (Episode)"

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