This ThunderCats t-shirt features an image of Mumm-Ra, the servant of the Ancient Spirits of Evil and the main villain on the classic animated series. The shirt reads Mumm-Ra Lives. After the Mutants of Plun-Darr came to Third Earth in pursuit of the Thundercats, they came across Mumm-Ra’s pyramid. Mumm-Ra forced them join forces with him to obtain the Sword of Omens. Mumm-Ra served as the main foe for the ThunderCats in each exciting episode.