Keldor is the original identity of Skeletor, the primary antagonist of the He-Man and the Masters of the Universe franchise. Keldor is a minor player in the Non Disney Villains Tournament, briefly appearing before turning into Skeletor and He also appears only on the prequel that explains the origin of the Disney VS Non Disney Villains War.
Disney Vs Non Disney Villains
Pre War VS The Archmage
Seeking to increase his mystic powers with the Grimorium Arcanorum, Keldor led his forces in an attack against the Archmage, Destane. The wizard quickly dispatched Keldor's minions, leaving Keldor himself to defeat Destane. Keldor easily outmatched the Archmage in fighting skills, using his twin sword with stellar precision. He is able to disarm the Archmage, but briefly lowers his guard. At that moment, the Archmage attacks him with a mystical skull bomb. Severely damaging Keldor's face, forcing Keldor and his warriors to flee.
Deal with Hordak
As the Archmage's poison burned away at Keldor's face, he forced his comrade, Evil Lyn to take him to the temple of the recently banished Hordak. The dying Keldor pleaded with Hordak's spirit to save his life. Hordak agreed, but it would come at a price. Hordak's powers transformed Keldor, as the flesh of his face burned away, leaving the horrifying visage of a skull. Upon seeing his new face, the newly christened Skeletor laughed maniacally.
Non Disney Villains Tournament
Keldor seeks a sceptre able to enhance his already formidable magical abilities. However, Skullmaster diligently guards the sceptre. Keldor lunges at his foe, only for Skullmaster to parry the blow. Despite throwing many attacks, Keldor cannot land a single blow upon his foe. Skullmaster even manages to disarm Keldor and melt his face. Writhing in agony, Keldor is forced to flee. Injured, Keldor is forced to make a pact and becomes Skeletor.