Paradox Brothers The Paradox Brothers , known as the Labyrinth Brothers ( 迷宮兄弟 " Meikyū Kyōdai " ) in the Japanese version , are a tag team , consisting of the twin brothers , Para and Dox . Their names are derived from the word in the dub , while their names in the Japanese version form the word " Labyrinth " ( 迷宮 " Meikyū " ) , which is spelled out by the kanji on their foreheads . Para has the kanji 迷 ( " mei " ) , while Dox has the kanji 宮 ( " kyū " ) . In the English manga , the word " Labyrinth " in their name is left untranslated , making them the Meikyū Brothers . Biography . Yu - Gi - Oh ! The brothers were hired by Maximillion Pegasus to work as Eliminator s in his Duelist Kingdom tournament . The two Duel as a team , with their " Labyrinth Wall " card enabling them to change the playing field to resemble a complicated underground labyrinth , making gameplay more akin to a board game than a card game . The two guard an underground area of the island . It is here that they meet Yugi Muto and Joey Wheeler , who must defeat them in order to pass and move onto Pegasus ' castle . They begin a Tag - Team Duel against one another , and the Brothers have a cohesive strategy , with their Decks built to play off of each other ' s . In addition to changing the gameplay , the brothers Deck ' s focus on the Summoning of their powerful " Gate Guardian " monster , by gathering its component pieces onto the field . Though they come close to victory , the brothers are defeated when Yugi fuses his " Summoned Skull " with Joey ' s " Red - Eyes B . Dragon " with " Polymerization " to form " Black Skull Dragon " , whose attack strength was able to surpass that of their " Gate Guardian " when Joey uses his " Copycat " card to use the brother ' s own " Riryoku " against them . With their victory , Yugi and Joey both obtain enough Star Chip s to gain entry into the tournament ' s final rounds . However , the Brothers still have another test that Yugi and Joey must pass . They inform them that one of the doors that leads out of the room will let them leave the caves , while the other simply leads to an endless maze . The brothers claim that from here on out , one of them will speak only lies , while the other will speak only the truth . Yugi realizes that both brothers are in fact lying , and they even have the ability to change which path leads where . They are tricked into admitting this via the use of a two - headed coin , and Yugi and Joey are able to move on . In the " Waking the Dragons " arc , they both appeared as lost souls as Yami Yugi ventured to find his other half . In the epilogue of the series , which is cut from the dub , the brothers are seen Dueling Mai Valentine and Vivian Wong on top of the . Yu - Gi - Oh ! GX . The Brothers are hired by Dr . Crowler to Duel Jaden Yuki and Syrus Truesdale , who will be expelled should they lose , due to their trespass at the Abandoned Dorm . They are introduced as legendary Duelists who fought against the King of Duelists , Yugi Muto , and gave him a hard time with their powerful combinations . The Duel is conducted in a more normal fashion this time , with the two Dueling using standard Duel Disk s . Their strategy still involves the Summoning of " Gate Guardian " , but they also reveal an even more powerful force — " Dark Guardian " , who can only be Summoned upon the destruction of " Gate Guardian " . The brothers focus their efforts on Syrus , believing him to be the weak link of the opposing team . This is very successful , but Jaden eventually gives Syrus the confidence to continue , and the brothers are once again defeated when their opponents pool their resources to Summon a Fusion Monster . This time , Syrus uses his " Power Bond " card to fuse his " UFOroid " with Jaden ' s " Elemental Hero Tempest " , forming " UFOroid Fighter " and doubling its ATK to 8000 , enough to attack " Dark Guardian " and wipe out their Life Points , even though it cannot be destroyed by battle . Voice and mannerisms . In the dub , the brothers speak using Chinese accents and almost exclusively in rhyme , with one brother finishing the sentence the other began . This is not present in the original . Decks . The Brothers play Labyrinth Decks , which focus on bringing out " Gate Guardian " .