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Kel'Thuzad began his magical career in the nation of Dalaran, where he toiled ceaselessly to uncover the mysteries of the Great Dark Beyond. There, he became a member of the Kirin Tor, a friend of Antonidas himself, and a very wealthy magocrat.

Soon, however, his curiosity for power got the better of him. A god-like power began to pull on his mind, and he found himself researching the forbidden arts of necromancy. He was shunned by his peers, and left, pulled by the culling of the malevolent Lich King to the frozen lands of Northrend.

There, amongst the blizzards and storms of ice and hail, he found the Lich King, and, in awe of the Lich King's sheer presence, he offered his soul, devoting all he was and all he had to whatever the Lich King demanded.

Kel'Thuzad's mind was opened up to the countless things that the Lich King had seen, and all that he knew, and the necromancer was given his first mission. He was to return to Lordaeron and facilitate the production of a vast army of undead, which resulted in the creation of the Plague.

Using his power and money to amass a small Cult of the Damned, Kel'Thuzad and his most trusted acolytes began to infect the granaries at Andorhal with the Plague. Andorhal was one of the primary distributors of grain in Lordaeron.

Kel'Thuzad, upon the Lich King's instruction, oversaw the infection of the small town of Brill, where he was discovered by Jaina Proudmoore and Prince Arthas. From there, he quickly fled, and they followed him back to Andorhal, where he told Arthas of Mal'Ganis in Stratholme. Arthas, in a rage, hunted Kel'Thuzad down and killed him. But they were not finished yet.

Kel'Thuzad waited patiently as a ghostly apparition until his protector, Gavinrad the Dire, was slain by a now-corrupted Arthas, and his remains were reclaimed. He appeared only to Arthas, and told him that he was not to trust the Dreadlords, promising to explain all of the Lich King's plans to Arthas once he walked the earth again in Quel'Thalas.

Kel'Thuzad watched over Arthas as he made the slow procession to the Sunwell in Silvermoon against the stratagems of Sylvanas Windrunner. Eventually, Arthas ravaged his way through the two Elfgates and finally breached Silvermoon itself. With the help of Tichondrius, Kel'Thuzad was reborn into the terrifying form of a lich.

As they traveled to Alterac, Kel'Thuzad explained that the Scourge was merely the harbinger of the Burning Legion, and that he would summon the first of the demons, the Eredar warlock, Archimonde, to the mortal world. After destroying the orcs guarding the Demon Gate, Kel'Thuzad communed with the dark lord, who told him that he must go to Dalaran and steal the Book of Medivh from Dalaran.

After Arthas led the attack on Dalaran and killed Antonidas, the book was retrieved, and Kel'Thuzad began the lengthy summoning process, with Arthas defending him from the many attacks of Dalaran and the Kirin Tor. Finally, all was complete, and Archimonde was set loose upon the world. His first act was to promote Tichondrius to leader of the Scourge, rendering Arthas and Kel'Thuzad of little use. However, Kel'Thuzad, confident in the Lich King's grand design, disappeared amidst the chaos of Dalaran's destruction.

Kel'Thuzad resurfaced as the Legion raked across the Plaguelands, and in the aftermath of the invasion, he remained in the Capital as one of the Lich King's lieutenants. Arthas had gone to Kalimdor on Ner'zhul's command, and so only Kel'Thuzad and the banshee Sylvanas Windrunner remained in his stead. But they knew that the Legion was defeated long before the Dreadlords who remained in Lordaeron did.

Arthas returned in a fury and chased the Dreadlords out of the Capital, and Kel'Thuzad was relieved to see him. With the Legion's generals gone, they turned to the human villages who were escaping to the mountain passes. Kel'Thuzad thought that perhaps they would be a fitting sacrifice to the Lich King.

But as they cut a swath through the human forces, Arthas suffered some violent siezures, and Kel'Thuzad considered recalling their forces. But the King forbade it, and they continued on their macabre mission.

In the aftermath, Arthas received a vision from Ner'zhul, who told him to return to Northrend. Kel'Thuzad immediately prepared for his departure, but they were abruptly ambushed by the Dreadlords, and separated. The Dreadlords unleashed all their forces against Arthas, but Kel'Thuzad found his own way out of the city. As he fled, Kel'Thuzad surmised that only Sylvanas had the position to arrange for this assassination attempt, and knew that until he reached Arthas, he was in grave danger.

Kel'Thuzad came upon Arthas in the clutches of Sylvanas and her wicked banshees. She was about to strike when Kel'Thuzad unleashed his forces against her and drove her away.

Kel'Thuzad escorted Arthas to the shore, where he had prepared a fleet of ships for his departure. Arthas asked Kel'Thuzad, as his most loyal servant and twisted friend, to remain in Lordaeron and ensure that his legacy remain.

Kel'Thuzad swore on what was left of his life to carry out that mission at all cost.

In the battle that would follow between Sylvanas and the Dreadlords, Kel'Thuzad took his forces into hiding, where he would plot his resurfacing into the new powers of the Plaguelands.