Thunderian

Thunderians were the inhabitants of the planet Thundera. They included the noble ThunderCats. They were foes to the various mutant species of the planet Plun-Darr, and it was they who in fact destroyed the Thundereans' homeworld with the utilization of the Sword of Plun-Darr. This caused their species to become extinct in the wild, and it is not known if any Thunderians other than a group of their nobility, the ThunderCats, escaped the world's destruction. The ThunderCats eventually crash landed on the planet Third Earth, where they served to protect the planet's benevolent inhabitants from the various dangers that existed thereon.