Yu - Gi - Oh ! 5D ' s - Episode 019 " Return to the Spirit World , Part 2 " , known as " Spirits ' World Contaminated : Evil Intent , the Super Demonic Lord Ido " in the Japanese version , is the nineteenth episode of the " Yu - Gi - Oh ! 5D ' s " anime . It first aired in Japan on August 6 , 2008 and in the US on January 17 , 2009 . Summary . The Spirit ' s world . Still in the World of the Duel Monster Spirits , Luna stands facing Sunlight Unicorn with Kuribon at her feet , anxious of a voice calling her . The voice calls her to come this way , reminding her that she promised to protect this world . Luna disagrees , not remembering making such a promise . Suddenly " Ido the Supreme Magical Force " appears , confronting her . Sunlight Unicorn leaps forward attacking and destroying it . The forest begins to shake , since it does not tolerate conflict , Sunlight Unicorn is destroyed . Determined to not let Sunlight Unicorn die , Luna concentrates . Meanwhile in reality , Frank says that he ' d like it if she told him what kind of world it is . Yanagi , Tanner and Dexter cheer Luna on from the stands , while Leo remains in a trance . In the competitor ' s box room , Yusei notices something is wrong with Luna and leaves . The tranced Luna uses the effect of " Horn of the Unicorn " , returning it to the top of her Deck . She then uses " Emergency Assistance " reviving " Sunlight Unicorn " and uses its effect to add " Horn of the Unicorn " from the top of her Deck to her hand . She then reequips it to " Sunlight Unicorn " , Sets 2 cards and ends her turn . In the Spirit ' s World , Sunlight Unicorn is reunited with Luna , but " Ido the Supreme Magical Force " has also revived itself . Ido progress toward Luna , but she climbs onto Sunlight Unicorn , accompanied by Kuribon . Together they dash away from Ido . Luna observes the change in scenery , the previously flourishing trees are now replaced with the bare rotten ones . The mysterious voice explains how the evil ones intents have polluted the world , as they try to bring the power of the Spirits into their dirty clutches . Grips with the situation . Sunlight Unicorn stops at the dry remains of a river , where a large crag stands behind it . The source of the voice is revealed to come from this feature . Luna glares forward heeding the shape of a large dragon on the face of the crag . Startled , Luna proclaims that she knows that dragon , Ancient Fairy Dragon . A gush of water quickly fills the dry river . Luna shields herself , with her arm . After lowering her hand , Luna now stands alone at her side of the river , now appears in its past beauty . A younger version of herself plays there with Kuribon , Sunny Pixie , Key Mace , Watapon , Spirit of the Breeze , Jerry Beans Man , Kuribon , Dancing Fairy and Petit Angel , while Ancient Fairy Dragon , in its prime watches over them . Young Luna creates a garland of flowers and places it on Kuribon , as a crown . The crown falls apart as the flowers wither . Ancient Fairy Dragon explains that this is happening because of the intent of the evil ones , who draw nearer to this world . Eventually they will try invade , pollute and twist its control to their desire . However there is one person , who can stop them , Luna . The world is linked to her thoughts , her good mind will repel away the mind of evildoers . Ancient Fairy Dragon , asks Luna to stay . Luna considers the idea . She gets lonely in reality , with her parents always away and Leo only thinking of himself . But this place is fun . She says that she ' ll stay there to protect them . The present Luna now remembers making that promise , but . . . Back in the real world , Yusei dashes into the arena . He calls Luna , but gets no response . He turns to Frank and notices that he too is now tranced . The tranced Leo in the stands is calling to Luna , where his consciousness lies . Leo then falls onto Dexter ' s lap . Tanner quickly checks him , finding that he ' s unconscious . Yanagi suggests that they take him to the infirmary . Luna remembers back then , when she made the promise , but then , she heard Rua ' s voice . The flashback at the other side of the river , reruns that moment and Leo is heard calling her name . Back then she got scared , she deserted them cause of Leo ' s cries . But she confesses , she was afraid , afraid to protect them , by herself . So she tried to forget about them and locked this world away in her mind . She hears a growling noise and turns to find Ido , now behind her . In reality , Yusei anxiousness elevates , as he spots a dragon birthmark glowing on Luna ' s arm . In Goodwin ' s box room , Zigzix on a floating screen reports a Ener - D reading . " There ' s no doubt she ' s a Signer , " he says , while hyperactively holding up his D - Sensor showing them the reading . Yusei watches Frank draw a card . Ido disappears from the Spirit World , leaving Frank now standing in its place . Having now lost his calm nature , he excitedly declares that for Luna to send him to this place , she really is a Signer . Luna is unaware of what a Signer is . Frank tells her that there are individuals , who desire her powers . Ido reappears behind him . Luna is now confused and states that she doesn ' t have any powers , why her ? She then orders to leave her alone . Surrounding trees begin to crumble , while a dark shadowy matter spreads around from below Frank . Terrified , Luna begins call for Leo , to start calling out to her , like he did last time to bring her back home . She hears Leo calling her name and looks around for him . She stares at her reflection in a nearby puddle , which changes to Leo ' s face and alternates between their faces each time one of them speaks . Leo says " You made a promise with them , didn ' t you ? " , that he wants to be strong like Yusei and that he ' ll protect her , so she can protect this world . The puddle disappears and a chunk falls from the crag . Luna fights . Luna stands up saying that she will . At this point , her eyes return to normal in reality . She declares to the carving of Ancient Fairy Dragon , that she will protect this world . She turns to face Frank . Her Duel Disk reappears on her arm and her and Franks cards assume their positions on the field . She activates her Trap Card , " Pixie Ring " , preventing him from attacking " Kuribon " anymore . Frank activates " Wave of Ill Intent " . " Ido the Supreme Magical Force " attacks " Sunlight Unicorn " causing Frank to lose 300 LP , but also causing Luna to also loses 300 LP , due to " Wave of Intent Evil ' s " effect . Then he plays " Spirit Contamination " destroying " Pixie Ring " , which was shielding " Kuribon " . " Ido " then revives itself . Luna begins her turn and takes damage from " Immortal Homeostasis " . Luna Sets a card and activates " Healing Wind " bringing her LP back to 1500 . Frank laughs maniacally saying he would be happy to defeat her , happy to see the look on the Spirits ' faces when this world suffers . More of the scenery crumbles as he laughs . Luna says that she cannot let him do this . " Ido " attacks " Kuribon " and Luna activates " Fairy Wind " , destroying all other face - up Spell and Trap Cards . " Kuribon ' s " ATK returns to normal and " Ido ' s " attack continues . Luna activates " Kuribon ' s " effect , returning it to her hand and canceling the damage , but also raising Frank ' s LP . She refuses to let him harm any anybody in this world . Frank laughs saying that he ' ll just pollute the world then , causing more parts of the scenery to fall apart . The fossilized Ancient Fairy Dragon emerges from the crag . It grabs Frank who is now so caught up in his laughter , he doesn ' t realize what is happening . Luna pleas with her to settle down . Her pleas come to no effect , so she tries to save Frank by ending the Duel . She activates " Oberon ' s Prank " , negating Frank ' s last LP gain and inflicting to same amount as damage to both players , dropping both their LP to 0 . Return to own world . Back in reality , both players regain their consciousness . Frank falls backwards . Luna sees him stand back up and is thankful he survived . Yusei catches Luna as she falls and carries her away from the Duel Field . She asks where Leo is , as Yusei does so . In the infirmary , Leo wakes up saying that he felt like he was dreaming , but has no memory of his dreams . He asks how Luna got on . Dexter directs their attention to a screen projection , where the MC announces , with a tone of regret , that the Duel has ended in a tie . He buries his face in is arms , saying that its a double elimination . Yusei observes Luna ' s dragon birthmark disappear as he carries her . Luna sees a spirit of Kuribon and tells it that she will protect them . She then leaps out of Yusei ' s arms , claiming to be okay and can walk herself . She gives one last wave to the crowd as she departs the arena . The episode concludes with a hand shown spinning the " Ancient Fairy Dragon " card . Featured Duel : Luna vs . Frank . Turn 5 : Luna " Sunlight Unicorn " attacks and destroys " Ido the Supreme Magical Force " ( Frank 4000 → 3700 ) . At the end of the Battle Phase , the third effect of " Ancient Forest " activates , destroying " Sunlight Unicorn " . The second effect of " Horn of the Unicorn " activates , returning itself to the top of Luna ' s Deck . Luna then activates " Emergency Assistance " to revive " Sunlight Unicorn " ( 1800 / 1000 ) in Attack Position . Luna then activates the effect of " Sunlight Unicorn " to add " Horn of the Unicorn " from the top of her Deck to her hand . She then equips " Sunlight Unicorn " with " Horn of the Unicorn " ( " Sunlight Unicorn " : 1800 → 2500 / 1000 → 1700 ) . Luna then Set s two cards ( " Oberon ' s Prank " and " Pixie Ring " ) . On Luna ' s End Phase , Frank activates the second effect of " Ido the Supreme Magical Force " to revive itself ( 2200 / 800 ) in Attack Position . Turn 6 : Frank Frank draws . Luna activates her face - down " Pixie Ring " . Now as long as Luna controls at least two face - up Attack Position monsters , this card will forbid Frank from selecting the monster Luna controls with the lowest ATK as an attack target . Frank then activates " Wave of Ill Intent " . Now , Luna will take 300 damage each time a monster Frank controls is destroyed by battle . " Ido the Supreme Magical Force " then attacks " Sunlight Unicorn " . " Sunlight Unicorn " then destroys " Ido the Supreme Magical Force " ( Frank 3700 → 3400 ) . The effect of " Wave of Ill Intent " activates ( Luna 1500 → 1200 ) . Frank then activates " Spirit Contamination " to destroy " Pixie Ring " as a monster was destroyed this turn . On Frank ' s End Phase , he activates the second effect of " Ido the Supreme Magical Force " to revive itself ( 2200 / 800 ) in Attack Position . Turn 7 : Luna Luna draws . The second effect of " Immortal Homeostasis " activates ( Luna 1200 → 900 ) . Luna then sets a card and activates " Healing Wind " to gain 200 LP for each monster on the field . There are currently three ( Luna 900 → 1500 ) . Turn 8 : Frank Frank draws . " Ido the Supreme Magical Force " then attacks " Kuribon " , but Luna activates her face - down " Fairy Wind " to destroy all other face - up Spell and Trap Card s and inflict 400 damage to each player for each destroyed cards with Spell Cards controlled by Frank being excluded from the second effect ( Frank 3400 → 2200 ; Luna 1500 → 300 ) ( " Kuribon " : 0 → 300 / 200 ) . Luna then activates the second effect of " Kuribon " to nullify the Battle Damage she would take and return " Kuribon " to her hand as well as increase Frank ' s LP by the ATK of " Ido the Supreme Magical Force " ( Frank 2200 → 4400 ) . Luna then activates her face - down " Oberon ' s Prank " to negate the effect of " Kuribon " ( Frank 4400 → 2200 ) and inflict damage to both players equal to the amount of LP that Frank would have gained ( Luna 300 → 0 ; Frank 2200 → 0 ) . The Duel ends in a DRAW . Featured cards . The following cards appeared in this episode . Cards in italics debuted here .