Yuya and his counterparts are the reincarnations of Zarc while Zuzu and her counterparts are the reincarnations of Ray Akaba, who came to be when Ray used the four cards created by her father, Leo Akaba, to split the Supreme King Dragon Zarc with herself and the United World, which resulted in the creation of their reincarnations and the Four Dimensions. During the Lancers' time in the Synchro Dimension, Celina was captured by Barrett and brought back to Duel Academy. By placing a Parasite Monster into her mind, the Doktor used her to capture Zuzu.