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Thulsa Doom is a fictional character first appearing in the Kull short story "Delcardes' Cat" by Robert E. Howard. He has since appeared in comic books and film as the nemesis of Kull and, later, one of Howard's other creations, Conan the Barbarian.

Thulsa Doom first appeared in the short story "Delcardes' Cat" by Robert E. Howard, which featured the character Kull as the protagonist. Howard submitted the story to Weird Tales in 1928 under the title The Cat and the Skull but it was not accepted. The story did not see print until 1967 in the paperback King Kull published by Lancer Books. Thulsa Doom is described by Howard in "The Cat and the Skull" as being a large and muscular man (As he and Kull are said to be "alike in general height and shape."), but with a face "like a bare white skull, in whose eye sockets flamed livid fire." He is seemingly invulnerable, boasting after being run through by one of Kull's comrades that he feels "only a slight coldness" when being injured and will only "pass to some other sphere when [his] time comes."

A powerful necromancer, Thulsa Doom is Kull's primary foe. He was often a featured foe in the Marvel Kull comics (for instance, Kull the Conqueror #3 and #7). Thulsa Doom returns in Kull the Conqueror #11, "By This Axe I Rule," based on an original story by Robert E. Howard. Posing as the nobleman Ardyon, he forms an alliance with four rebels within Valusia: the dwarfish Ducalon, the soldier Enaros, Baron Kanuub, and the minstrel Ridondo, who actually dethroned the hero, and set him on a quest to regain his lost kingdom, in the pages of his own comic, until it gets cancelled. Kull resumes his quest in the pages of Kull and the Barbarians, a black-and-white Marvel magazine format (published under the Curtis Magazines imprint). Thulsa Doom sent members of the Black Legion to ambush Kull and Brule, though they won the fight. Thulsa observed the battle through a magic crystal. Kull and Brule's ship was later attacked by a sea serpent, with which Thulsa may or may not have had anything to do.

Kull and the Barbarians lasted three issues until it was cancelled. In the return of Kull the Destroyer, Thulsa Doom/Ardyon learned of the curse of Torranna (essentially, if a scarred man wore the crown and sat the throne, he'd be unable to ever leave the throne), which he determined to bestow upon Kull. To this end, he took on the aspect of the god of Torranna and advised its inhabitants how best to bring this about. Thulsa Doom manipulated Garn-Nak, Karr-Lo-Zann, and Norra of Torranna. They drew Kull into Torranna and had him undergo a series of trials to gain the crown of Torranna. Kull sought the crown because he believed he could use the army of Torranna to help him retake the crown of Valusia from Thulsa Doom.

Thulsa Doom has not been a contender in any CBUB matches.