The Doktor The Doktor is an antagonist in " Yu - Gi - Oh ! ARC - V " . He is a member of Duel Academy . According to Sora Perse , he is one of the Professor ' s closest aides . He possesses the ability to brainwash individuals through the use of his " Fusion Parasite " cards . Design . Appearance . The Doktor is a tall and thin old man with fair skin , sunken eyes and cheeks , bags under his eyes , small green pupils , and long white hair in a style reminiscent of Rex Goodwin . He wears a long dark gray coat with an orange brown center that is patterned with yellow lines , in addition to gray pants and black shoes . Personality . The Doktor is ruthless , sadistic , and manipulative . He enjoys using his Parasite Monster s on people to force them to do what he wants , mainly by torturing his opponents by sending his brainwashed minions after them . If something goes wrong with his Parasite Monsters , the Doktor seeks ways to improve on them . Abilities . The Doktor has created Parasite Monster s which he can implant in other individuals . According to Sora , this gives the Doktor the ability to alter their hearts and minds , causing them to act as he wants them to . Etymology . His title " Doktor " is pronounced " " Dokutoru " " ( ドクトル ) in the original Japanese rather than " " Dokutā " " ( ドクター ) , which indicates that his title is in German . was a German doctor who worked for the Nazis , earning his nickname " Angel of Death " . Mengele ' s life inspired works in different media , and the German Nazi doctor stereotype inspired different kinds of doctor characters , many of them being villainous like the Doktor . Biography . History . Not much is known about the Doktor , except that he is known as being in Leo Akaba ' s inner circle . At different points in time , he used his mind - controlling abilities on Rin , Lulu Obsidian , and Celina . Heartland City . He was first mentioned by Sora to the Lancers as they traveled to Duel Academy . He revealed rumors about a high - ranking individual with the ability to alter people ' s hearts as the reason of why Celina betrayed them . The Doktor is seen in person next to Leo himself and learned that Zuzu Boyle was captured . Leo noted that he had all the necessary pieces and that it was time for Yusho Sakaki to learn the truth , while the Doktor shuffled his Deck , drawing " Fusion Parasite " with glee . Through a monitor , he smiled after he watched Apollo and Diana being defeated at the hands of Yugo and Kite Tenjo respectively . He witnessed the reunion between Yugo and Rin while staring at his drawn " Fusion Parasite " with an evil smile . As he watched Yugo and Rin Duel each other , the Doktor asked Leo his thoughts about his Parasite Monster s being able to program their hosts into being loyal to him . Leo praised his skill but warned him about losing the girls , and the Doktor told him that they must have ways to defend themselves due to their value . He reassured him that his Parasite Monsters were perfect . He laughed when he heard Yugo trying to make Rin remember and commented that the Rin he knew was gone due to her fighting for Duel Academy by choice . He wondered what could Yugo do after being pushed back so far and noted that his Parasite Monsters are more stubborn than him . When Rin defeated Yugo , he congratulated her and called her back as the Professor was waiting for her . The Doktor watched Shay and Kite argue about Lulu ' s sanity and he wondered if the siblings ' bond could break the Professor ' s will , while drawing " Fusion Parasite " again . He was proud that his Parasite Monster seemed to control Lulu even through her bond with her sibling , but he was pleasantly surprised when Shay defeated Lulu . He found the resulting data interesting and he left to make room for improvements on his Parasite Monsters . He laughed as he and Celina watched Lulu and Yuya Sakaki on the monitors , and he stated that he knew something like this would happen and was glad that he had placed a Parasite Monster into a Duel Academy student in advance . He stated that the " insects " were drawn towards something and called Celina a " queen " . At some point he placed a Parasite Monster into Zuzu , brainwashing her . He watched Lulu look for Kite , wondering whether or not he should proceed while laughing . Lulu met up with Yuya , and as they departed to help Shay , the Doktor decided that it was time for her to serve him and he drew " Fusion Parasite " again , turning Lulu against Yuya . Shay arrived during Yuya and Lulu ' s Duel ; the Doktor saw him as an annoying disturbance and dispatched Celina to deal with Shay . Celina tased Shay and joined the Duel , and the Doktor declared that it was time for Yuya to meet his maker . Celina Fusion Summon ed " Parasite Queen " , and the Doktor called it a success , claiming that his genius had created the ultimate Parasite Monster , and he told them to rampage to their heart ' s content . Yuya declared that he would defeat the Doktor and save the girls ; the Doktor dared them to if they could defeat Lulu and Celina . During the Duel , a Parasite Monster entered Yuya ' s ear , much to the Doktor ' s pleasure . He prepared to place Yuya under his control , but to his surprise , Yuya resisted the control . Yuya Summoned " Odd - Eyes Pendulum Dragon " , and the Doktor commented that Yuya ' s ace monster had finally appeared , but his Parasite Deck had yet to show everything off . He appeared to Yuya through a monitor , telling him how terrifying his Parasite Deck was and told Yuya he ' d never be able to meet Zuzu because he would be defeated her . He showed Yuya that Zuzu was already under his control and cut the feed , but this prompted Yuya to defeat Celina and Lulu in a fit of rage . Celina and Lulu returned with Yuya chasing after them , and the Doktor introduced himself and trapped Yuya in a cage . He then told the Professor that Yuya had been secured and left with all four girls . Duel Academy . Under the Professor ' s instructions , the Doktor brought the girls to him . He told the Professor that everything was ready and asked him to leave Yuya to him so he could find out why his insect disappeared from Yuya , wanting to experiment with the queen . The Professor was skeptical that the Doktor would be able to win , but the Doktor thought that it wasn ' t impossible and expressed confidence in his Parasite work . He told the Professor that as fellow researchers , they should share a similar curiosity in confronting challenging research . The Professor noted the Doktor ' s dangerous thinking and recalled his own past curiosity and proceeded to seal him into a card . After Zarc ' s defeat , the Doktor was freed from his card . Deck . His Deck is unknown , with his only revealed card being " Fusion Parasite " .