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Mount Plun-Darr is a dark and gloomy rocky outcrop on Third Earth. It is located a short distance away from the City of Dogs and is a rich source of Thundrillium of which there are numerous deposits around the area.
Many years ago, the warlord Ratilla wreaked havoc on Third Earth after he came into possession of the Sword of Plun-Darr and the Gauntlet of Plun-Darr. He was stopped by Jaga who put an end to his reign of terror.
In order to prevent the Sword of Plun-Darr falling into the wrong hands again, Jaga put a powerful curse on it and then caused a mountain to grow around it, burying it deep in the rocky outcrop's heart. This is how Mount Plun-Darr came into existence.
Many years later, Ratilla's descendent Ratar-O sought to reclaim the Sword of Plun-Darr. With his loyal Rats, he made his enslaved Cats mine for the Sword, getting many of them killed in the process. Eventually it was Lion-O and the ThunderCats who put a stop to Ratar-O and freed the Thunderian Slaves.