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Grune was a ThunderCat and the general in command of Thundera's armies. His great grandfather was Lord of the ThunderCats.
After three years of peace Grune hungered for battle and power. He considered the Thunderians unworthy of the service of the ThunderCats and sought to rule them as Gods. Grune attempted a military coup that was faced down by the mighty Jaga. The two fought for hours and eventually Grune was defeated. Using the Sword of Omens, Jaga encased Grune in a cage and banished him into space.
Grune reached Third Earth where he looted and dispensed terror across the planet, gaining the name of Grune the Destroyer. He was eventually captured and sealed in a tomb where he remained for centuries until he was released by two Bolkins, Bundun and Hurrick. The Bolkins entered the tomb during powerful thunderstorm
in the hope of finding treasure. In doing so, they broke the seal and release Grune in spirit form. He quickly found the Cats' Lair where he drains the Thundrillium and grows to a giant size. Grune then locates a source of Thundrainum and forges a mace from it.
Grune returned to the Cats' Lair where he hoped to gain revenge against Jaga. Lion-O called on the help of Jaga using the Sword of Omens and the two battled again. When Jaga lost his sword, Lion-O threw him the Sword of Omens. Grune's Thundrainum mace weakened Jaga and Lion-O gave him his strength and eventually defeated his old friend. When Grune offered Jaga his hand in friendship he took the Sword of Omens from Jaga's belt. The Sword rejected Grune and he disappeared.
Appearances
- The Ghost Warrior (1st appearance)
- ThunderCats - HO! Part 5
- Return to Thundera Part 2
Background
Grune also appeared in the comic Origins: Villains and Heroes.