Thundera was destroyed at the beginning of the series. The city fell due to an attack lead by the lizard general Slithe and the traitor Grune, completely devastating the city-state. Now only the ThunderCats and some surviving Thunderians remain. In spite of the peace enjoyed by the cats, many of the other species of Thundera did not enjoy such comforts, such as the dogs and tailed cats whom all lived in the slums. The Cat Slaves from Mount Plun-Darr are currently living in the ruins of Thundera.