Mumm-Ra is the main antagonist of the ThunderCats franchise. He is an undead sorcerer that is an eternal servant of the Ancient Spirits of Evil. Despite his status as a sorcerer, he is actually some sort of demonic being. In various fan-made Power Rangers series. He serves as a major antagonist and as the primary one in some. Mumm-Ra often forms alliances with the likes of Rita Repulsa and Lord Zedd, often with a very poor relationship.