Yu - Gi - Oh ! GX - Episode 146 " Conquering the Past , Part 1 " , known as " The Sealed Fusion " in the Japanese version , is the one hundred and forty - sixth episode of the " Yu - Gi - Oh ! GX " anime . It first aired in Japan on July 25 , 2007 and in the US on May 31 , 2008 . Summary . After escaping the cave , Jaden Yuki and what little remains of his group continue on , and end up in a vast snowy wasteland . Jaden reaches some sort of ornate gate topped with a gargoyle , and is compelled to enter . Zane Truesdale stops him by throwing a shock collar in front of him . Zane questions whether Jaden is in any state to be able to rescue anyone , after Jaden states he knows Jesse Anderson is in that building . Zane believes Jaden ' s fighting spirit has left him , and as such , he ' s in no mental condition to save anyone from anything . Zane challenges Jaden to a Duel , stating that if he can ' t defeat Zane , he ' ll have no chance against whatever force has captured Jesse . Jaden finds he can ' t bring himself to play " Polymerization " as while he was The Supreme King , he had used fusion cards extensively , resulting in many deaths to aide in the completion of " Super Polymerization " . Unable to overcome this mental block , he instead Summons " Elemental Hero Clayman " in Attack Position , without any sort of strategy to take advantage of that ( not even wanting to use " Polymerization " due to the dark memories ) . Zane uses " Cyber End Dragon " equip ped with " Armored Cybern " to destroy " Clayman " and all three of Jaden ' s Set cards . He comments that if Jaden had played " Elemental Hero Sparkman " and " Spark Blaster " , he could have destroyed " Armored Cybern " last turn . After destroying " Hero Barrier " Zane states that if Jaden had utilized the previous combo , he could have then used " Hero Barrier " to negate the attack of " Cyber End Dragon " , which means he would have won , since Zane would have then taken 4000 damage from the effect of " Power Bond " . He then destroys " E - Emergency Call " and comments that if " Sparkman " wasn ' t in Jaden ' s hand , he could have put it there using that card . Jaden had all the components necessary to win - but due to his mental block , could not play them . Jaden states that he ' s committed so many crimes , but he simply sat back and watched from the recesses of his heart as The Supreme King slaughtered many using fusion cards . Zane tells him that if he has no will to fight , he can ' t rescue Jesse . Zane declares a direct attack , but his heart begins to give out again , and the Duel ends prematurely . Jaden walks away on his own and Zane comments that all of those underground Duels using the electrodes took a huge toll on his heart , without him even realizing it until recently . Jaden wanders , trying to figure out a way to atone for his sins . Only Winged Kuriboh accompanies him , though Syrus Truesdale and Ojama Yellow covertly follow to watch over him . He ends up back at the arena where he Dueled Brron , and the site of the deaths of Chazz Princeton , Alexis Rhodes , Tyranno Hassleberry and Atticus Rhodes . Jaden is then ambushed by Guardian Baou , the final remaining member of The Duelists of Death . Baou intends to defeat Jaden , so he may inherit the title of Supreme King and rule over this dimension . He believes such a rule wouldn ' t be legitimate unless he defeats the previous ruler . Jaden accepts his challenge , determining that since his friends died here , it would be a suitable place for him to die as well . The Duel begins , and Jaden again blunders his first turn and is unable to use " Polymerization " . He is then on the brink of losing due to this . Later , Bastion Misawa and Tania arrive and join Syrus , having heard rumors about The Supreme King . Featured Duels . Jaden Yuki vs . Zane Truesdale . Turn 1 : Zane Zane draws " Armored Cybern " ( 0 / 2000 ) and subsequently Normal Summon s it in Defense Position . He then set s a card . Turn 2 : Jaden Jaden draws " Elemental Hero Clayman " . Jaden ' s hand contains " Polymerization " , " Elemental Hero Sparkman " , " Hero Barrier " , " E - Emergency Call " , and " Spark Blaster " . Jaden , upon seeing " Polymerization " , receives a vision of the Supreme King ' s evil acts , which haunts him . Jaden Normal Summons " Elemental Hero Clayman " ( 800 / 2000 ) in Attack Position and sets three cards ( " Spark Blaster " , " Hero Barrier " , and " E - Emergency Call " ) . Turn 3 : Zane Zane draws " Power Bond " and subsequently activates it to fuse his three " Cyber Dragons " together and Fusion Summon " Cyber End Dragon " ( 4000 / 2800 ) in Attack Position . Due to the effect of " Power Bond " , the ATK of " Cyber End Dragon " is doubled ( " Cyber End Dragon " : 4000 → 8000 / 2800 ) . Zane then activates the first effect of " Armored Cybern " to equip the latter to " Cyber End Dragon " . Now during each of Zane ' s Main Phases , he can activate the second effect of " Armored Cybern " to decrease the ATK of " Cyber End Dragon " by 1000 and destroy one card on Jaden ' s side of the field . Zane activates the effect of " Armored Cybern " four times to destroy all cards on Jaden ' s side of the field ( " Cyber End Dragon " : 8000 → 7000 → 6000 → 5000 → 4000 / 2800 ) . Zane prepares to use " Cyber End Dragon " to attack directly , which would win him the Duel , however Zane ' s heart problems begins to act up , which causes the Duel to end with no result . Jaden Yuki vs . Guardian Baou . Turn 1 : Baou Baou draws " Fiend Slime Mold " and subsequently Normal Summons it ( 500 / 0 ) in Attack Position . He then sets a card . Turn 2 : Jaden Jaden draws " Polymerization " . Jaden ' s hand contains " Elemental Hero Burstinatrix , " Elemental Hero Wildheart " , " Elemental Hero Bladedge " , " Hero Mask " , and " Feather Shot " . Jaden Normal Summons " Elemental Hero Burstinatrix " ( 1200 / 800 ) in Attack Position . " Burstinatrix " attacks " Fiend Slime Mold " , but Baou activates his face - down " Gravity Gain " . Now all Level 4 or lower monsters can ' t attack . During each of Baou ' s Standby Phases , he must either Tribute one monster or destroy " Gravity Gain " . The attack made by " Burstinatrix " is then nullified . Turn 3 : Baou Baou draws . On Baou ' s Standby Phase , he activates the effect of " Fiend Slime Mold " to pay 500 Life Points ( Baou 4000 → 3500 ) and Special Summon another " Fiend Slime Mold " ( 500 / 0 ) in Attack Position . Baou then activates the effect of the newly summoned " Fiend Slime Mold " ( Baou 3500 → 3000 ) to Special Summon a third " Fiend Slime Mold " ( 500 / 0 ) in Attack Position . Baou then Tribute s one " Fiend Slime Mold " to keep " Gravity Gain " in play . Baou Tributes another " Fiend Slime Mold " in order to Tribute Summon " Twinheaded Beast " ( 1700 / 1900 ) in Attack Position . " Twinheaded Beast " attacks and destroys " Burstinatrix " ( Jaden 4000 → 3500 ) . " Twinheaded Beast " attacks directly as it can attack twice during each Battle Phase ( Jaden 3500 → 1800 ) . Turn 4 : Jaden Jaden draws " Revoke Fusion " . He then Normal Summons " Elemental Hero Wildheart " ( 1500 / 1600 ) in Attack Position . Baou assumes that Jaden will use " Wildheart " to attack and destroy " Fiend Slime Mold " since " Wildheart " is unaffected by Trap Cards , however he intends to use " Twinheaded Beast " to attack and destroy " Wildheart " and attack directly , which will win him the Duel . " Duel continues in the next episode " . Featured cards . The following cards appeared in this episode . Cards in italics debuted here .