Yu - Gi - Oh ! ARC - V - Episode 127 " Revival Zero " is the one hundred and twenty - seventh episode of the " Yu - Gi - Oh ! ARC - V " anime . It aired in Japan on October 16th , 2016 and in Canada on January 26 , 2018 . It became available with official subtitles via Crunchyroll on November 28 , 2017 . Summary . In the midst of explaining , the Professor is interrupted by a notification of Yuya ' s intrusion into the inner chambers , slightly exhausted from his Awakening . Riley , Declan , and Yusho are relieved to see him , and Yuya hugs his father . The Professor then tells The Doctor to immediately begin the Revival Zero project as the Doctor stands no fighting chance against Yuya , but the Doctor expresses his overconfidence in his Parasite work and that as fellow researchers , they should be sharing a similar curiosity in confronting Yuya . The Professor agrees then turns the Doctor into a card , freeing the girls from his brainwashing in the process , as he expresses that his own past curiosity was what caused the Supreme King Dragon ' s birth in the first place . The Professor reveals the girls and continues to tell his story of how he investigated a way to stop Zarc ' s fused form . By traveling the world and following the theory of Duel Monsters with souls while researching different natural environments , Leo was able to create four Spell Card s subtitled under the names " Flowers , Birds , Winds , and Moon " from the natural energy that he believed could counter Zarc . However , when Leo had just finished creating the four cards , Ray stole the cards , as she could not bear the thought of losing her father . Leo tried to give chase to his daughter , but she activated one of the cards , destroying the surrounding buildings and blocking his way with rubble . Leo then took a different road and eventually saw Ray confronting Zarc , as she activated the four cards , causing the related natural energy sources of flowers , birds , wind , and the moon to react and converge within Ray ' s body . The reaction of natural energies then created the Four Dimension Bracelets on Ray ' s right hand . The natural energy convergence then caused a reaction in both Ray and Zarc ' s bodies , and subsequently de - fused the Supreme King Dragon from his dragons as well as Ray ' s and Zarc ' s original bodies into four , creating their dimensional counterparts and the Four Dimension Dragons . When Leo opened his eyes next , he found himself flung back in time in the newly formed Standard Dimension where no ARC System or Fusion , Synchro , or Xyz Summon ing existed . Suffering from partial amnesia and unable to remember who he was , Leo still retained his research skills , so he made his living by conducting experiments on the standard KaibaCorp Duel Disk , upgrading the incorporeal Solid Vision into the ARC System as it once was in the Original Dimension . Around this time , he met Yusho and created the Leo Institute of Dueling , together introducing Action Duel s to the Standard Dimension . Later , Leo started to remember about his memories of the future , but was unable to guess why , so he created a machine that searched and visualized his future memories , making him realize that Ray was still alive , split within the Four Dimensions . ( In the English Dub , the revelation of the girls ' origin is stated at this point . ) Declan interrupts and elaborates with his view at that time , that Leo was so immersed in his incomprehensible research causing his mother to become erratic , and Declan , hoping to bring relief to his mother , wandered into Leo ' s lab and was transferred to Duel Academy in the Fusion Dimension . Leo continues that when on Duel Academy searching for Ray , he instead found Celina , who resembled Ray in her childhood , but found no traces of Ray ' s memories in her . In his investigation , he concluded that Ray and Zarc must have been split into four and were reborn in separate four dimensions as Zuzu Boyle , Celina , Lulu Obsidian , Rin , Yuya , Yuto , Yugo , and Yuri respectively . Leo reveals the secret chamber behind him containing the carded people from different dimensions from the Arc Area Project and his intention to use their natural energy as a catalyst in the ARC - V Reactor that will refuse the separated Dimensions back into the Original Dimension as well as reviving Ray by fusing her dimensional counterparts as well ( In the English Dub , Leo also states that the girls ' s existences will be erased in the process . ) , thus fulfilling Revival Zero ' s goal . Having finished explaining his motives to Declan , Yusho , Riley , Yuya and Ray ' s Dimensional counterparts , Leo tells Declan to join him and defeat Yuya immediately , as the fusing of the Four Dimensions will not just result in Ray ' s fused revival , but Zarc ' s revival as well , opening the possibility that the Supreme Dragon King may be reborn and the only way to stop the undefeated Zarc for good is through a Duel . However , Declan rejects his father , stating that he has seen Yuya ' s true nature in his Dueltaining , which has brought genuine happiness to the people of different dimensions , and that as the founder of the Lancers , it is his and Yuya ' s shared duty to stop Leo ' s ambitions . The three activate their Duel Disk s , and the Action Field Crossover is activated . Featured cards . The following cards appeared in this episode . Cards in italics debuted here .