ThunderCats — Season 1, episode 21 watch online
ThunderCats, season 1 episode 21 «Birth of the Blades»: air date May 12, 2012. Episode overview, season trailer and the cast of ThunderCats.
As Lion-O and Pumyra try to evade Mumm-Ra and his forces in the mines of Mount Plundarr in an effort to keep the Sword of Plundarr out his hands, we flash back in time and discover its origin ... and its relationship with the Sword of Omens.
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Episodes — Season 1
- 1 Episode 1 «The Sword of Omens (1)» July 29, 2011
- 2 Episode 2 «Ancient Spirits of Evil (2)» July 29, 2011
- 3 Episode 3 «Ramlak Rising» August 5, 2011
- 4 Episode 4 «Song of the Petalars» August 12, 2011
- 5 Episode 5 «Old Friends» August 19, 2011
- 6 Episode 6 «Journey to the Tower of Omens» August 26, 2011
- 7 Episode 7 «Legacy» September 2, 2011
- 8 Episode 8 «The Duelist and the Drifter» September 9, 2011
- 9 Episode 9 «Berbils» October 28, 2011
- 10 Episode 10 «Sight Beyond Sight» November 4, 2011
- 11 Episode 11 «The Forest of Magi Oar» November 11, 2011
- 12 Episode 12 «Into the Astral Plane» November 18, 2011
- 13 Episode 13 «Between Brothers» November 25, 2011
- 14 Episode 14 «New Alliances» March 24, 2012
- 15 Episode 15 «Trials of Lion-O, Part One» March 31, 2012
- 16 Episode 16 «Trials of Lion-O, Part Two» April 7, 2012
- 17 Episode 17 «Native Son» April 14, 2012
- 18 Episode 18 «Survival of the Fittest» April 21, 2012
- 19 Episode 19 «The Pit» April 28, 2012
- 20 Episode 20 «Curse of Ratilla» May 5, 2012
- 21 Episode 21 «Birth of the Blades» May 12, 2012
- 22 Episode 22 «The Forever Bag» May 19, 2012
- 23 Episode 23 «Recipe for Disaster» May 26, 2012
- 24 Episode 24 «The Soul Sever» June 2, 2012
- 25 Episode 25 «What Lies Above, Part 1» June 9, 2012
- 26 Episode 26 «What Lies Above, Part 2» June 16, 2012