Yu - Gi - Oh ! GX - Episode 155 " Return of the Supreme King , Part 3 " , known as " Rainbow Neos VS Yubel Ultimate Form " in the Japanese version , is the one hundred and fifty - fifth episode of the " Yu - Gi - Oh ! GX " anime and the " final episode " to be dubbed . It first aired in Japan on October 3 , 2007 and in the US on July 12 , 2008 . Summary . Jaden continues his final confrontation with Yubel , having just Summoned " Rainbow Neos " . By using one of its effect s , Jaden puts the cards in Yubel ' s Graveyard back into her Deck , preventing " Samsara Lotus " from reviving itself , in turn preventing the effect of " Yubel - Terror Incarnate " from triggering . Jaden successfully overcomes " Terror Incarnate " , only to have this trigger the Summon of " Yubel - The Ultimate Nightmare " . Yubel herself merges with this new form , appearing out of one of the dragon ' s horns . In the Japanese version , Yubel questions why Jaden is using Jesse ' s cards and directly states that she believes that the love Jaden once gave Yubel now belongs to Jesse . Yubel uses her powers to allow Jaden to view the distant past , and their full history is finally disclosed . In a past life , Jaden was a resident ( prince in the dub ) of an unnamed Kingdom . In this life , Yubel was human , a young girl . The King tasks Yubel with protecting Jaden from The Light of Destruction until he is mature enough to utilize his innate powers as The Supreme King to eradicate The Light . To do so , Yubel must equip herself with armor from a hideous dragon . Jaden ' s past life pledges his love to Yubel , and states he will love her for all time ( in the dub , the prince promises to keep Yubel by his side ) . In the present , Jaden tells Syrus to let everyone else know he is sorry for all the trouble he caused them . He promises to return soon , but first he must help Yubel . Jaden disappears in a wall of rainbow light , and Syrus weeps . Jaden is next seen within the wall , and continues his Duel with Yubel . She activates " Super Polymerization " and intends to fuse the twelve dimensions together and destroy them all . Jaden chains his " Spiritual Fusion " to the " Chain Material " she had played - allowing him to choose the Fusion Material Monsters . He chooses his soul and Yubel ' s . This unites Yubel with The Supreme King forever , fulfilling her wish and preventing the destruction of all existence . The portals between dimensions close , and nearly everyone is transported back to Duel Academy . The exceptions are Bastion Misawa , who chose to stay with Tania , as well as Adrian , Echo and Zane , who appear to have truly died . Jaden himself also does not reappear . Featured Duel : Jaden Yuki vs . Yubel . " Duel continues from the previous episode " . Turn 14 : Jaden Jaden activates the third effect of " Rainbow Neos " to send the top card of his Deck ( " Elemental Hero Necroshade " ) to the Graveyard and returns all cards in Yubel ' s Graveyard to her Deck . He then activates his face - down " Arms Hole " to send the top card of his Deck ( " Necro Gardna " ) to the Graveyard and add " Rainbow Veil " from his Deck to his hand , however he won ' t be allowed to Normal Summon or Set any monsters this turn . Jaden then activates " Rainbow Veil " and equip s it to " Rainbow Neos " . Now if " Rainbow Neos " battles a monster , that monster ' s effects will be negated during the Battle Phase only . " Rainbow Neos " attacks " Yubel - Terror Incarnate " . Due to the effect of " Rainbow Veil " , the effects of " Yubel - Terror Incarnate " are negate d until the end of the Battle Phase , however Yubel activates her face - down " Fiend Rose " and equips the latter to " Yubel - Terror Incarnate " . Due to the second effect of " Fiend Rose " , " Yubel - Terror Incarnate " is not destroyed and Yubel takes no Battle Damage . Turn 15 : Yubel Yubel draws . She then activates the third effect of " Spell Chronicle " to remove two Chronicle Counters and make Jaden select one of the remaining cards removed by " Spell Chronicle " . Jaden selects " Mystical Space Typhoon " , so the latter is added to Yubel ' s hand . Yubel then activates " Mystical Space Typhoon " to destroy " Rainbow Veil " . " Yubel - Terror Incarnate " attacks " Rainbow Neos " , but Jaden removes from play " Necro Gardna " from his Graveyard to negate the attack . Turn 16 : Jaden Jaden draws " Fifth Hope " and subsequently activates it to return " Avian " , " Burstinatrix " , " Sparkman " , " Prisma " , and " Neos " from his Graveyard to his Deck and draw two cards . The second effect of " Spell Chronicle " activates , giving it a Chronicle Counter . Jaden then Normal Summons " Elemental Hero Clayman " ( 800 / 2000 ) in Defense Position . He then activates the first effect of " Rainbow Neos " to send " Clayman " to the Graveyard and returns all monsters Yubel controls to her Deck . Since " Yubel - Terror Incarnate " has left the field , its final effect activates , allowing Yubel to Special Summon " Yubel - The Ultimate Nightmare " in Attack Position . This monster has the same first effect of " Yubel " and " Yubel - Terror Incarnate " and Yubel will take no Battle Damage from battles involving " Yubel - The Ultimate Nightmare " . Also , when this monster battles a face - up Attack Position monster , that monster will be destroyed at the end of the Damage Step and Jaden will take damage equal to its ATK . Jaden then Sets a card . Turn 17 : Yubel Yubel draws . " Yubel - The Ultimate Nightmare " attacks " Rainbow Neos " , but Jaden activates his face - down " Alchemy Cycle " to reduce the ATK of " Rainbow Neos " to 0 ( " Rainbow Neos " : 4500 → 0 / 3000 ) and prevent it from being destroyed by battle . The attack ends in a stalemate . After damage calculation , " Alchemy Cycle " removes " Rainbow Neos " from play and allows Jaden to draw one card . Yubel then Sets a card . Turn 18 : Jaden Jaden draws " Elemental Hero Neos " . He then uses the effect of " Elemental Hero Necroshade " to Normal Summon " Elemental Hero Neos " ( 2500 / 2000 ) in Attack Position without Tributing . Jaden then Sets two cards . Turn 19 : Yubel Yubel draws . " Yubel - The Ultimate Nightmare ] ] " attacks " Elemental Hero Neos " , but Jaden activates his face - down " Mirage Tube " to negate the attack of " Yubel - The Ultimate Nightmare " and inflict damage to Yubel equal to the ATK of " Elemental Hero Neos " ( Yubel 2900 → 400 ) . The second effect of " Spell Chronicle " activates , giving it a second Chronicle Counter . Yubel then activates the third effect of " Spell Chronicle to remove two Chronicle Counter s and make Jaden select one of the remaining cards removed by " Spell Chronicle " . She believes Jaden will select " Grinder Golem " , but Jaden selects " Super Polymerization " , so the latter is added to Yubel ' s hand . Yubel then activates her face - down " Chain Material " which will allow her to use monsters on her side of the field , in her hand , in her Deck , and in her Graveyard as Fusion Material Monsters when she performs a Fusion Summon this turn , but those Fusion Material Monsters will be removed from play . Yubel chooses twelve monsters , each with a consecutive Level from 1 to 12 ( which represent the twelve dimensions ) : " Grave Squirmer " , " Giant Germ " , " Chaos Core " , " Phantom of Chaos " , " Dark Summoning Beast " , " Infernal Incinerator " , " Maju Garzett " , " Lava Golem " , " Infernal Flame Emperor " , " Raviel , Lord of Phantasms " , " Gate Guardian " , and " Yubel - The Ultimate Nightmare " and activates " Super Polymerization " to fuse all 12 dimensions and Fusion Summon " Super Fusion God " , but Jaden activates his face - down " Spiritual Fusion " in response to the activation of " Chain Material " , allowing Jaden to select the Fusion Material Monsters used for the Fusion Summon of " Super Polymerization " . Jaden chooses to fuse himself with Yubel . After " Super Polymerization " fuses Jaden and Yubel ' s souls , the Duel ends with no result . Featured cards . The following cards appeared in this episode . Cards in italics debuted here .