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Watch ThunderCats - Season 1 Episode 21 Online!:

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

Writing:
  • Tobin Wolf
  • Theodore Walter Wolf

Stars:
Release Date: 2011-07-29
Seasons: 1
Metacritic: 7.5/10
TMDb: 8.0/10
  • Country: US
  • Language: English
  • Runtime: 30

Other episodes for this season

Omens (1)
Episode 1 - Omens (1)
Omens (2)
Episode 2 - Omens (2)
Ramlak Rising
Episode 3 - Ramlak Rising
Song of the Petalars
Episode 4 - Song of the Petalars
Old Friends
Episode 5 - Old Friends
Journey to the Tower of Omens
Episode 6 - Journey to the Tower of O...
Legacy
Episode 7 - Legacy
The Duelist and the Drifter
Episode 8 - The Duelist and the Drift...
Berbils
Episode 9 - Berbils
Sight Beyond Sight
Episode 10 - Sight Beyond Sight
The Forest of Magi Oar
Episode 11 - The Forest of Magi Oar
Into the Astral Plane
Episode 12 - Into the Astral Plane
Between Brothers
Episode 13 - Between Brothers
New Alliances
Episode 14 - New Alliances
The Trials of Lion-O (1)
Episode 15 - The Trials of Lion-O (1)
The Trials of Lion-O (2)
Episode 16 - The Trials of Lion-O (2)
Native Son
Episode 17 - Native Son
Survival of the Fittest
Episode 18 - Survival of the Fittest
The Pit
Episode 19 - The Pit
Curse of Ratilla
Episode 20 - Curse of Ratilla
Birth of the Blades
Episode 21 - Birth of the Blades
The Forever Bag
Episode 22 - The Forever Bag
Recipe for Disaster
Episode 23 - Recipe for Disaster
The Soul Sever
Episode 24 - The Soul Sever
What Lies Above (1)
Episode 25 - What Lies Above (1)
What Lies Above (2)
Episode 26 - What Lies Above (2)