The masked man reveals himself as Alexander the Great; he also explains their final test is to slay the Fiendish Five, dragons terrorizing a village. The village IS protected, by a mighty dragon of light, but its power grows weak at night. Alexander gives Grandpa a Curse of Dragon, while Yugi gains Black Luster Soldier. The Fiendish Five, consisting of Tyrant Dragon, Meteor Dragon, Serpent Night Dragon, Water Dragon and Luster Dragon #2, is seemingly defeated; however, they return and force the group back to the village. The Pharaoh realizes that the fabled blade able to slay them can only be removed when they approach the village; he uses it to cut them down. However, the Fiendish Five combine into Five-Headed Dragon, which can only be slain by Light monsters.

The heroes attack with Seiryu, Dark Witch, Thunder Dragon, Shovel Crush, and Happy Lover - monster of light. However, their attacks prove useless against the Five-Headed Dragon/Fiendish Five. A villager prays to the dragon of light and it emerges from its tablet, revealing itself as Blue-eyes White Dragon; it fuses with the Pharaoh, who uses its power and the sword's to put an end to the Fiendish Five. Alexander warns that Dr. Alex Brisbane is possessed by his dark side; he once wore a "lucky charm" - the Millennium Ring - which caused his soul to split in two. Though he did win, his inner evil prevented him from opening the door; his good side was imprisoned in the game, while his evil side wondered the pyramid. Using Grandpa as a vessel, Alexander escapes the game and fights with his evil side in Brisbane; however, his evil side proves too strong, and he tricks Grandpa into giving him the key. They all race to the room at the top of the pyramid, where a struggle ensues. They end up falling into a void, where Shadi awaits them.

Shadi tells everyone that they must battle the evil Alex using their capsule monsters, the winners will be given the chance to obtain ultimate power. The spirits of evil Alexander's old servants return. Everyone is on a battlefield now, and release their monsters, beginning the final battle for ultimate power. As the gang fights Alexander's servants, he watches from his giant stone monster, Reshef the Dark Being. As the rest of the gang defeat the servants' monsters, Alexander takes their power to summon Seven-Armed Fiend. Seven-Armed Fiend is then revealed to be the monster from Yugi's dreams. Solomon remembers every arm has a different ability making it almost indestructible. They all fight it, and, after much effort, finally defeat it, when Yami Yugi uses the Millennium Puzzle to confuse the creature. Alexander tells them they'll never win.

"Evil" Alexander tells Yami Yugi there is no way he can win. Then he orders his front line to attack. Tristan's Shovel Crusher and Tea's Dark Witch are destroyed. Then Joey attacks Reflect Bounder, but his attacks are reflected and he says "I should have seen that coming". Grandpa's Curse of Dragon and Tea's Seiyaryu distract two of Alex's followers so Yugi can attack. He attacks with "Chaos Blade" and gets a direct hit on Alexander. But then Alexander attacks with "Multi-directional laser assault". Magician of Black Chaos rescues Yugi and he exclaims "Sorry; slight miscalculation on my part". Curse of Dragon then attacks Total Defense Shogun but the attack fails. Saying a lust for power would be his downfall, Yami attacks Alexander with Celtic Guardian, Magician of Black Chaos, and Black Luster Soldier. The attack causes Reshef's lasers to turn off. Alexander sacrifices his servants monster, and, in turn, his servants, to release Reshef's full power. The gang's attacks have no effect. Yami tries to get his friends to leave, not wanting them to be hurt any further. They give a speech about how they are in this together, and will never leave their friend's side. Suddenly, Seiyaryu, Red-Eyes Black Dragon, Curse of Dragon, and Thunder Dragon all combine around Yugi, forming the Armor of Unity. Yami Yugi then flies at Alexander, blasting energy through him. Alexander is finally defeated, and the Pharaoh turns down the offer for ultimate power. Shadi compliments him on being a "true king," and they all return home.