Yu - Gi - Oh ! 5D ' s - Episode 018 " Return to the Spirit World , Part 1 " , known as " The Ancient Forest : Invitation to the Spirit World " in the Japanese version , is the eighteenth episode of the " Yu - Gi - Oh ! 5D ' s " anime . It first aired in Japan on July 30 , 2008 . Summary . Lazar and Frank ' s meeting . Lazar talks with Frank in a poorly lit chamber . Light peers in through a bared window , leaving most of Frank ' s face hidden in shadow . Lazar apologizes for having Frank lose his Duel on purpose , due to the turn of events . There is a certain duelist they would appreciate him saving his abilities for . At the Stadium . The crowd watch Yusei , who has just won his Turbo Duel against Hunter Pace . Leo boasts to Dexter about Yusei ' s skills , until he is shot down by Luna , who reminds him how he lost in the first round . Leo buries his shame , acting innocent , as he says Luna is the one who lost . As the two bicker the MC announces that Goodwin has made a proposition . All players who lost in the first round are to participate in a consolation game . Leo gets excited ready to play as Luna again . As Leo looks though his Deck , considering reorganizing it , he asks Luna if he can borrow her clothes again . Another disagreement between the duo is cut off by the MC as he prepares to call out the participants in the next Duel . Luna ' s name is called out , Leo stands up , without having made any change in outfit , but the spotlight drops on Luna . In a competitor ' s room Greiger notes that that must be the real Luna , the imposter , he dueled , showed some fine dueling . He wonders how the real thing will fare . Luna gets uneasy , considering what to do . She doesn ' t want to duel , considering she gets really tired from dueling . The crowds chants for Luna begin to heat up . Leo sits back disappointed , that after getting a chance to duel Yusei , he ' s sorry to see it has to end like this . Luna reluctantly steps up and gathers her Duel Disk under her arms . As Luna leaves her companions , Yanagi asks Leo about her Deck . Leo tells him how Luna had built a " Spirit Deck " , since she was able to communicate with Duel Spirits , who told her to make a Spirit Deck . Slightly puzzled , Tanner asks that that be ran by him again . Leo continues as he says that she gets tired after hearing the Spirit ' s voices , explaining why she gets tired after a Duel . Timidly Luna makes her way down a flight of steps to the arena with the spotlight and the audience ' s attention following her . Goodwin ' s box room . Jack having just learned Luna is a Signer talks with Rex Goodwin , who explains that the consolation game , is to affirm that she is a Signer . A click of his finger summons a holographic screen of Zigzix . Whilst twirling , Zigzix takes lapses to explain that they need a small reading on his D - Sensor to prove she is a Signer . A wave of Goodwin ' s hand dismisses the projection . He then pulls another holographic screen of Luna . He touches some buttons on the screen , as he tells how they entered her in the tournament upon learning of an incident from eight years ago . A swish of his hand pushes the screen over to Jack and causes a number more screens of Luna eight years ago to crop up around it . He informs Jack , that eight years ago , Luna had fallen into a coma , while dueling . Pointing his finger in front of him calls up another projection of Leo in the audience . Leo had always been by her side , calling her name . One month later she recovered , he explains . Lazar interrupts as Jack asks how this relates to Signers , telling him that after the coma , she claimed to have been in the World of Duel Monster Spirits for that time . Lazar works the magic with the projections as he brings up one of the Nazca Lines , while talking about theories of the origins of Duel Monsters . Goodwin continues that after the eight years , neither of the twins have any recollection of those events . He feels that taking her back to that world is in order , as they might learn her true power . The Duel . The MC calls out the prodigy Luna . Her Duel Disk fits on neatly , thanks to Yusei ' s adjustments . Frank is introduced . He walks out and bows to Luna , saying he is glad to meet her acquaintance . Uneasily , Luna lets out a " same " . He asks how about finding the real her , hidden within the inner depths of her consciousness . Luna then hears another voice , make a squeaking whisper . She responds to it mentally , " Yeah , you have the same uneasy feeling " . Hoping to end the Duel as soon as possible , she Summons her first Spirit , " Sunny Pixie " . Frank brings out " Symmetry Rorschach " . He uses the monster to conduct the . He asks her what the monster looks like to her . Luna is bewildered by the circumstances , but in the crowd , Yanagi and Dexter call out that its " Crystal Skull " and a butterfly respectively , but Leo is worried about what Luna ' s opponent is up to . Reluctantly Luna says " A Spirit ? " , as the monster then takes on the form of her monster . The monster then grows a demonic head and attacks her " Sunny Pixie " . Luna yells as her monster is destroyed by it . Frank ' s voice remains calm and open , says that the test has revealed that she is afraid . He then asks if she is afraid of spirits and fairies . Luna attempts to begin to explain that that ' s not how it is , but is cut off by Frank . He says it is fine , he shall clear any worries she has . To do so she must courageously enter the world of the Duel Monster Spirits . He is aware that she can talk to spirits , so deduces that her being in a world of spirits isn ' t strange at all . Luna wonders how such a world can exist . Frank then uses the effect of " Symmetry Rorschach " , revealing the top card of her Deck . Luna is slightly relieved to see " Kuribon " . Frank , calm as always , asks her if she is able to hear its voice . Knowing it to be true , Luna begins to get more uneasy , she then turns to face Leo in the crowd , right before a flashback of her past . She hears Leo calling her name , but is unsure if that just happened or if she had imagined it . Leo begins to feel Luna ' s fear . Frank continues the Duel , Sets two cards and passes to Luna . Luna brings out " Kuribon " to her aid . But Frank plays " Light to the Depths " , hypnotizing her as he does so . The sixth card " Ancient Forest " is activated . After explaining its effect , Frank interprets it as a world that doesn ' t tolerate conflict . Luna awakens in the World of Duel Monster Spirits . Despite the tranquility of the place , she still feels afraid . Back in reality , Luna remains in a trance . Frank plays " Gestalt Trap " on " Kuribon " . In the Spirit world , the shackle from the Trap appears and wraps itself around " Kuribon " . Followed by " Immortal Homeostasis " , also targeting " Kuribon " . Next Frank Tributes " Symmetry Rorschach " for " Ido the Supreme Magical Force " . In the Spirit World , Luna attempts to attend to " Kuribon " , but is then confronted by Frank ' s monster . In reality , Luna remains motionless . The crowd begin to yell at her , that she ' s going to lose , if she continues like this . Dexter notices Leo is experiencing the same loss in concentration . " Kuribon " takes " Ido the Supreme Magical Force ' s " , blow but survives due to the effect of " Immortal Homeostasis " . Despite its survival Frank explains that " Kuribon " experiences a world of pain , due to its immortality . He then reminds Luna of her true mission . Remembering conflict isn ' t tolerated in the forest , Luna watches Ido get destroyed . Her smile of relief is cut short as it revives itself . In reality , the tranced Luna draws and takes damage from " Immortal Homeostasis " before Summoning " Sunlight Unicorn " and equipping it with " Horn of the Unicorn " . ( The English anime mistakenly has 8 Level Stars on the " Sunlight Unicorn " card . ) In the Spirit World , the unicorn appears ready to assist Luna . A voice than begins calling her name . She looks around and the voice asks her , if she came to fulfill her promise to protect the Duel Monster Spirit World from the evil ones . Featured Duel : Luna vs . Frank . Turn 1 : Luna Luna draws " Sunny Pixie " and subsequently Normal Summon s it ( 300 / 400 ) in Defense Position . Turn 2 : Frank Frank draws " Symmetry Rorschach " and subsequently Normal Summons it ( 1200 / 1200 ) in Attack Position . " Symmetry Rorschach " then attack s and destroy s " Sunny Pixie " . The effect of " Symmetry Rorschach " then activates , revealing Luna ' s top card ( " Kuribon " ) . Frank then Set s two cards . Turn 3 : Luna Luna draws " Kuribon " and subsequently Normal Summons it ( 300 / 200 ) in Attack Position . Frank then activates his face - down " Light to the Depths " to send the top five cards of Luna ' s Deck to the Graveyard ( among them are " Swords of Revealing Light " and " Fairy King Truesdale " ) . The next top card after those cards , " Ancient Forest " , is then added to Luna ' s hand . If Luna does not activate the card that was just added to her hand by the end of this turn , she will take 2000 damage . Luna activates " Ancient Forest " . Now , monsters cannot be summoned in Defense Position or be changed into Defense Position and if a monster attacks , it will be destroyed at the end of that turn ' s Battle Phase . Turn 4 : Frank Frank draws . He then activates his face - down " Gestalt Trap " and targets " Kuribon " for its effect . Now as long as " Gestalt Trap " is face - up , the ATK of " Kuribon " will be reduced to 0 ( " Kuribon " : 300 → 0 / 200 ) and its effects will be negated . Frank then equips " Kuribon " with " Immortal Homeostasis " . Now , " Kuribon " can ' t be destroyed by battle and during each of Luna ' s Standby Phases , she will take 300 damage should the ATK of " Kuribon " be different from its original ATK . Frank Tribute s " Symmetry Rorschach " to Summon " Ido the Supreme Magical Force " ( 2200 / 800 ) in Attack Position . Frank ' s hand contains " Spirit Contamination " and " Pot of Avarice " . " Ido the Supreme Magical Force " then attacks " Kuribon " . Due to " Immortal Homeostasis " , " Kuribon " is not destroyed ( Luna 4000 → 1800 ) . At the end of the Battle Phase , the third effect of " Ancient Forest " activates , destroying " Ido the Supreme Magical Force " . 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 5 : Luna Luna draws . Luna ' s hand contains " Emergency Assistance " , " Horn of the Unicorn " , " Sunlight Unicorn " and " Oberon ' s Prank " . On Luna ' s Standby Phase , the second effect of " Immortal Homeostasis " activates ( Luna 1800 → 1500 ) . Luna then Normal Summons " Sunlight Unicorn " ( 1800 / 1000 ) in Attack Position . She then activates " Horn of the Unicorn " , equipping it to " Sunlight Unicorn " and increasing its ATK and DEF by 700 ( " Sunlight Unicorn " : 1800 → 2500 / 1000 → 1700 ) . Featured cards . The following cards appeared in this episode . Cards in italics debuted here .