Slithe was the political and military leader of the planet Plundarr since the time of the Clone Wars. At first, he steered his world in a pro-Separatist stance, but later became pro-Palpatine and pro-Galactic Empire. He later became a serious rival of Lion-O when he became ruler of the rival planet Thundera and Lord of the Thundercats. He was a Plundarran Lizardman.