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During the Waking the Dragons arc, Dark Magician Girl brought Yugi and Yami Yugi to the World of Duel Monsters to revive the Sacred Dragon Timaeus to help them to fight the Doma. She did the same with Kaiba and Joey who gained the dragons, Critias and Hermos.

When Dartz summoned the The Great Leviathan, Dark Magician Girl opened a portal to the Duel Monster world, and led an attack against the Leviathan with Yugi, Kaiba and Joey.

Source from Wikipeida