Background and HistoryMumm-Ra was a character from the animated TV series ThunderCats. He was the main (and certainly the most dangerous) villain on the show, demonstrating absolute mastery of both arcane and clerical magic. He often used the Mutants of Plun-Darr as his pawns.
An ancient native of Third Earth, Mumm-Ra serves as the undead focus for the Ancient Spirits of Evil - four god-like entities of nearly unlimited power, but whose influence is limited to the Black Pyramids found on either Third Earth or New Thundera. As such, outside of either pyramid, they can only interact with the physical world through Mumm-Ra. They provide him with immortality, as granted through his sarcophagus in exchange for perpetual servitude.
Mumm-Ra usually resides in his Black Pyramid as a withered, corpse-like being; however, he can alter his form by reciting the following incantation: "Ancient spirits of evil, transform this decayed form to Mumm-Ra, the Ever-Living!" This transforms him into a muscular fiend who menaces the ThunderCats with episode-long challenges before being driven back into his sarcophagus.
Mumm-Ra is regarded as immortal, and when defeated or 'killed', he simply returns to his sarcophagus. Initially, Mumm-Ra could not stand the sight of his own reflection; if he caught a glimpse of himself he would revert to his mummified form and flee to his pyramid. Eventually however, the Ancient Spirits of Evil rid Mumm-Ra of this vulnerability when he they revived him following his failure to harness the power of the Star of Thundera.
Mumm-Ra displays a god-like power in reforming the planet Thundera in order to retrieve the Sword of Plundarr (originally responsible for the planet's destruction). Once he acquires this sword, he becomes more than a match for the Sword of Omens.
He also assumes alias forms to deceive the ThunderCats on various occasions. Among these are:
Diamondfly, a tiny sprite-like creature luring Lion-O into a trap (in the episode "Queen of Eight Legs").
Gregory Gregion, a jovial troll who tricks Lion-O into attacking Tygra and breaking the Sword of Omens (in the episode "All That Glitters").
Silky, a flower-like creature with a human face, who enthralls Tygra with addictive fruit (in "The Garden of Delights").
The Netherwitch, a sorceress sending Lion-O into the Astral World (in "The Astral Prison").
Pumm-Ra, a "Puma Thunderian" of a more bestial appearance than Pumyra. He used this disguise to stage Cheetara's "rescue" and trick his way into Cats' Lair (in the episode "Pumm-Ra").
He once took the form of King Arthur to acquire the legendary magic sword Excalibur, using it against the Sword of Omens.
What Makes him a Hero/VillianMumm-Ra possesses nearly unlimited knowledge of and experience with numerous mystical arts from all corners of the universe. As such, he can summon their use to assist him in almost any manner he chooses, most commonly being: superhuman strength, self-levitation, necromancy, transmogrification, temporal manipulation, teleportation, telekinesis, astral projection, scrying, energy blasts, etc. By acting as a conduit for the Ancient Spirits of Evil, he can amplify these abilities to a nearly cosmic scale as well as retain his undead status despite the passage of time or any injuries sustained.
He's in my top 3 of villians of the 80s.