A sorcerer and demon-priest, Mumm-Ra is an ancient native of Third Earth and the greatest threat faced by Lion-O and the Thundercats in their many quests. Serving the Ancient Spirits of Evil, four god-like entities and the source of his powers and immortality, Mumm-Ra makes it his mission to expand their darkness all across the world and will stop at nothing to eradicate the Thundercats whenever they go. A frail old mummy on the outside, by chanting this incarnation: "Ancient spirits of evil, transform this decayed form to Mumm-Ra, the Ever-Living!" becoming much more powerful and bigger than before at the cost of a time limit to how long he can go outside of his pyramid.

Classification: Demon priest, sorcerer

Powers and Abilities: Superhuman physical characteristics, weapon mastery, dark magic, mind control, shapeshifting, flight, hypnotism, illusion creation, energy projection, transformation, immortality(Types 1,4, and 7. Possibly type 8 as he claims he will live as long as evil exists)

Attack Potency: Large Building level physically (Can contend and even overpower the likes of Panthro and Lion-O) possibly higher. Higher with magic(The Sword of Plun-darr which he wields caused a chain reaction that destroyed the planet of Thundera. His body was drained to power up a device that could suck the life force out of Third Earth)

Speed: Subsonic(Has tagged Cheetara who can run at 120MPH casually) with Massively Hypersonic combat speed(Can summon forms of lightning with his magic, can keep up with more than one Thundercat)

Lifting Strength: Class 100, likely higher(Overpowered Panthro who could lift a tank with ease. Comparable if not superior to Lion-O who pulled a large ship down mid-air)

Striking Strength: Large Building level(Can clash with Lion-O)

Durability: Large Building level, immortality makes it hard to kill him

Stamina: Extremely High(Is undead, spent centuries locked inside of a tomb building a pyramid)

Range: Standard melee range, several hundred meters with projectiles and magic. Planetary to Cross-Dimensional through the Ancient Spirits of Evil and their magic

Standard Equipment: Sword of Plun-darr

Intelligence: Extremely High(One of, if not the most intelligent character in the series, capable of orchestrating master plans that involve entire planets and span several years to great results.)

Weakness: Seeing his own reflection, later overcame it. Has a time limit to how long he can stay transformed outside his pyramid.