Bakura was a villager in Kul Elna, and was its only survivor when Akhenaden and his forces massacred the village, sacrificing 99 humans to create the Millennium Items. At the time, he was only a child and watched in horror as his family and friends were killed and their bodily components used to create the seven Millennium Items. However, Bakura soon acquired a powerful Ka: "Diabound", created from his hate and the vengeful spirits of Kul Elna. He soon developed a violent hatred felt grudge for the Pharaoh Akhenamkhamen for ordering the massacre, and the royal family including his son Atem, as well. Bakura soon waged war on the newly crowned Pharoah Atem and his forces. The full details of this conflict aren't known, but the High Priests and Atem were able to kill Bakura, before eventually having his soul sealed within the Millennium Ring alongside a portion of Zorc's soul, eventually merging with it to create a new entity.
Bakura robbed various treasures from the tomb of the former Pharaoh, Akhenamkhamen, including his mummy, and assaults the Palace of the Pharaoh, introducing his ka, Diabound, to the royal court and demands for the Millennium Items. Inflamed by the fact that he brought the mummy, the priests rose up to challenge him. Diabound easily defeated the ka of the priests and had the upper hand, until Atem Summoned "The God of Obelisk", whose strength was equal with Diabound's, causing him to flee.
The next day, he followed Mahado into the Valley of the Kings. Mahado's men blocked off the entrance of a cave where Mahado and Bakura went inside, so that Bakura couldn't escape. Mahado summoned his ka, "Illusion Magician". Bakura had the upper hand during the Duel, eventually stealing the Millennium Ring from Mahado. However, the Duel turned out to be a draw when Mahado sacrificed his life to fuse his ka and ba together to create "Dark Magician". Mahado then created a blast so powerful that Bakura was believed to have died.
Injured after this battle, he entered an inn, demanding lots of food, and his payment being a golden bracelet worth more than the inn itself. Whilst eating, a group of men surrounded him, threatening to kill him and take the gold around his neck, including the Millennium Ring. Bakura then muttered something and the men were mutilated, just as he finished his food and got up to raid the city again.
He entered the monster shrine, where Akhenaden stays in. Bakura decided that Akhenaden could be useful to him if he let him live. Bakura then put a part of Zorc's soul into the Millennium Eye to put an influence on Akhenaden's mind. He then fled, with Atem in pursuit. Atem summons "Slifer the Sky Dragon" to battle Diabound. However, since Diabound defeated Mahado's "Shadow Ghoul", Diabound acquired the ability to hide in the dark. He used this as an advantage to stealthily attack "Slifer". When Diabound was just about to kill "Slifer", Seto's "Duos" blocked the attack - the priests have arrived. Atem eventually sacrificed Slifer to be able to tell where Diabound was hiding. Seeing Diabound's blast, Seto ordered one of his ka to attack Diabound. However, they noticed that he stabbed "Illushu" instead and it blocked the attack. Because "Slifer" was destroyed, Atem was severely crippled. However, the arrival of Yugi Mutou and his friends restored the ba of Atem. Atem then summoned "The Sun Dragon Ra" which destroyed Diabound and killed Bakura. However, Akhenaden's future self, the High Priest of Darkness, reversed time, where Diabound destroyed Slifer, and Bakura stole the Millenium Pendant, and Atem fell into an abyss.
Bakura returns to Kul Elna and inserts the Millennium Ring and the Millennium Puzzle into the Millennium Tablet. Bakura then awaits the arrival of Atem and his guardians in Kul Elna and calls upon "Diabound" to fight them. Mahado arrives in the form of "Dark Magician" to aid Atem and Mana comes with "Dark Magician Girl" to help as well. Although the attacks of these spellcasters are powerful, "Diabound" is protected by a shield created by the spirits of those who died in the Kul Elna incident. Seto, Kalim and Isis arrive, and Seto and Kalim combine their "Duos" and "Curse of Dragon" respectively to create "Duos Dragon". This new beast is able to combat "Diabound" until Bakura uses "Bone Snapper" to attack Kalim himself, killing Kalim and destroying "Curse of Dragon" and separating the fusion. However, Kalim's last act was melting a part of the ghost shield with "Duos Dragon". "Dark Magician" then blasted "Diabound", as there was an opening in the ghost shield, and destroyed it. With "Diabound" defeated, Bakura is on the verge of death and desperately attempts to put the Millennium Items back into the Millennium Tablet. However, due to the fact that some of the items are still with their respective guardians, this is worthless until Akhenaden arrives and paralyzes the entire group. Dark Bakura then tells him he has served his purpose and reduces him to sand.
Bakura has used the following ka: