Brron , Mad King of Dark World ( character ) Brron , Mad King of Dark World serves as the first main antagonist of the Dark World arc of season three . He makes his first actual appearance in episode 135 when Jaden travels to his stronghold . Demented and sadistic , Brron rules the alternate dimension as its vile dictator . Although his role in the anime is brief , his actions are vital in Jaden Yuki ' s transformation into the Supreme King of the alternate dimension . Voice / Mannerisms . In the dub , Brron ' s voice is high - pitched and he has a witch - like cackle probably to assert the fact that he is the mad or insane king of Dark World . Biography . Being the leader of the Dark World creatures , Brron was responsible for the deplorable state of the second alternate dimension and oppression of its denizens . His right - hand man , Zure , oversaw Brron ' s will , detaining anyone who defied him in internment camps while killing duelists who could be threats to him . The executions occurred at his fortress and involved releasing monsters at disarmed duelists while Brron himself and his minions watched the spectacle . After learning of Jaden ' s presence in his domain , Brron orchestrated a plot that involved turning Jaden evil . Due to an underhanded maneuver by his top subordinate , Zure , Brron had a clear advantage with his set of " Wicked Rune " cards because should one of them be activated one of Jaden ' s friends would be sacrificed . Eventually , Jaden defeated Brron in a fit of rage , but not before Alexis , Chazz , Atticus and Tyranno were all sacrificed . Only Syrus managed to avoid that fate . After his defeat , Brron mocked Jaden by saying that he would never see his friends again before dying . It was later revealed that Brron was simply one of Yubel ' s pawns , who used him to complete the integral part for her plan , the creation of the " Super Polymerization " card , and to simultaneously coax Jaden towards his descent into darkness ( although it isn ' t stated how the two of them ever met , if they met at all ) . Non - canon appearances . Brron , Mad King of Dark World appears in " Yu - Gi - Oh ! World Championship 2008 " in a Tag Team with Reign - Beaux , Overlord of Dark World as his tag partner . He also appears as an unlockable opponent in Free Duel mode in " " . Decks . Anime . Brron plays a Dark World Deck , evil creatures whose latent abilities are activate d when they are discard ed by a card effect . He mainly focused on the gathering of the " Wicked Rune " cards which grants Brron access to his most powerful monster , " Colorless , Chaos King of Dark World " , Summoned through the card , " Super Polymerization " , although the Colorless card is not actually seen due to the fact that Brron could not offer Syrus through " Wicked Rune - Doubt " . If the aforementioned strategy fails , Brron focuses on the Summoning and preservation of " Reign - Beaux , Overlord of Dark World " . Video games . World Championship 2008 . In " Yu - Gi - Oh ! World Championship 2008 " , Brron uses a Dark World Decks titled , Portable Darkness and Sleepless Mind . Stardust Accelerator . In " " , Brron uses a Dark World Deck titled , See My Dark Side .