Yu - Gi - Oh ! 5D ' s - Episode 078 " Dawn of the Duel Board , Part 2 " , known as " A Nightmare Reborn ! Machine Emperor Skiel " in the Japanese version , is the seventy - eighth episode of the " Yu - Gi - Oh ! 5D ' s " anime . It first aired in Japan on September 30 , 2009 and in the United States on November 6 , 2010 . Summary . With a maniacal laugh , Lester thanks Leo and Luna for setting off his Traps , allowing him to summon his greatest monster . He dares them to bring it on , declaring that " " I ' ll show you what true Dueling is all about ! " " The Duel is observed by Primo and Jakob from their throne room . Primo remarks that Lester is getting ahead of himself ; Jakob replies that it is just the way children are . He admits that he remembers the days when he was just like Lester , but Primo simply looks back at the screen . Observing " Machine Emperor Skiel ∞ , " Leo says that It ' s a combination monster . As he wonders if it is the thing Yusei was talking about , he realizes Yusei said something important about it , which he tries to remember . An image of " Kuribon " is shown hiding behind Luna . As she asks if " Kuribon " is scared , an image of " Regulus " appears , warning Luna to be careful ; he senses something dangerous from her opponent . Luna wonders if the whole situation is some kind of terrible trap . Meanwhile , Yusei and Jack are racing towards Luna ' s location on their Duel Runners . As they do , Yusei ' s Mark of the Dragon begins to glow , causing him pain . Yusei thinks to himself that something is going on with Luna ; he can only hope that he makes it in time . He is broken from his thoughts when Crow and Akiza arrive on their Duel Runners ; from the looks on their faces , they ' re just as worried for Luna as Yusei and Jack are . Back at the Duel , Lester asks what the twins are going to do - he gleefully suggests that they surrender . Leo angrily wonders who ' d surrender to Lester before setting a " Trap ; unfortunately , Lester promptly counters by using " Trap Stun " to prevent anyone from activating Traps on this turn . With Leo ' s plan halted , Lester commands " Skiel " to attack Leo directly , making him scream in pain as his Life Points drop to 1800 . Luna says Leo ' s name in extreme concern , but Leo rides his way out of the smoke , only slightly injured . Luna smiles in relief as Lester asks how Leo liked the attack of his " Machine Emperor " . Threatening to rough him up even more next time , he sets one card Face - down and ends his turn . Luna tells Lester that he won ' t be hurting Leo anymore , and uses her turn to quickly summon her " Ancient Fairy Dragon . " Lester quietly says " There it is ! " as Jakob and Primo continue to watch ; Jakob simply says the monster ' s name , while Primo makes no comment . Luna uses " Ancient Fairy Dragon ' s " effect to Special Summon the level 3 " Fairy Archer " in Defense mode , before using " Fairy Archer ' s " effect to deal 400 points of damage to her opponent ' s Life Points for each LIGHT Attribute monster on the field . Leo comments that Luna has two Light Attribute monsters , so that ' s 800 points of direct damage . " Fairy Archer " forms a bow and hits Lester in the back with an arrow , creating a small explosion that brings his Life Points to 3200 - however , Lester simply brushes off his arm . Leo comments that Lester didn ' t feel the damage at all and Luna wonders what ' s going on . Lester sneers that he ' s not the type to feel such a trifle amount of pain as Luna ends her turn with two Set cards . Meanwhile ; Yusei and the others have caught up to the twins and spotted the Machine Emperor . As Crow comments on " Skiel ' s " appearance , Akiza asks Yusei if that was the monster used by Ghost . Driving up to get a better look , Yusei says that this monster is different . . . but with the same mark on its chest , it ' s undoubtedly in league with " Wisel " . Crow rhetorically asks how many of these monsters are out there , but Yusei doesn ' t answer - having spotted the twins , he calls their names . Jack muses that " Ancient Fairy Dragon " has been summoned - and if " Skiel " is anything like the other " Machine Emperor " , that can only mean trouble . Sure enough , Lester activates the effect of " Machine Emperor Skiel ∞ " on his turn - once per turn , it can absorb an opponent ' s Synchro Monster ! As " Skiel ' s " chest begins glowing green , Leo realizes that this is what Yusei was talking about earlier . As Yusei says " Synchro prevention ! " and Jack muses that this monster is indeed the same as its counterpart , " Machine Emperor Skiel ∞ " releases strings of green energy to seize " Ancient Fairy Dragon " . To everyone ' s shock , the bird - like Machine absorbs the dragon despite its struggles - from his throne , Jakob seems pleased . Luna laments that " Ancient Fairy Dragon " has been absorbed , while Crow curses that they were too late . Lester gloats at his successful capture of " Ancient Fairy Dragon " . As Leo mutters that he ' s got to remember things more quickly , he sees Lester flying into the air . Leo gasps as he recalls seeing Lester doing tricks on his Duel Board - he tells Luna that their opponent is the same kid they met back at the academy . Luna is shocked by this new information , while Lester turns to them , saying that they caught on too late . Observing Luna through his visor and thinking " " Now I ' m going to make you draw the circuit ! " " , Lester explains that " Machine Emperor Skiel ∞ " gains attack power equal to the ATK of an equipped Synchro Monster ; with " Ancient Fairy Dragon , " it ' s now at 4300 ATK ! Leo comments in surprise at its increase in power . Lester ' s next move is to play " Speed Spell - Summon Close " - when his SPCs are at four or more , it prevents the opposing players from Special Summoning during this turn . Leo curses at his strategy being negated again , but Lester says he sees right through their tactics . He commands " Machine Emperor Skiel ∞ " to attack Leo directly , but Luna activates her face - down Trap card , " Twinkle Wall " . By taking half the damage of an opponents attacking monster , this card will negate it ' s attack . Luna ' s card shields Leo from " Skiel ' s " attack , but parts of the blast hit Luna - she screams in pain while Leo screams her name . As the smoke clears , Luna is struggling to even stay up as her Life Points go from 2500 to 350 . Despite this , Luna thinks that she can handle the pain , blaming herself for trusting Lester and dragging Leo and herself into this situation . The others watch in silence , but look very worried - even Lester mentally encourages Luna to keep fighting as he sets one card face - down and ends his turn . As Leo begins his turn and looks at his hand , he vows to protect Luna from Lester ' s assault . He summons " Morphtronic Scopen " , explaining he can Special Summon a level 4 or lower Morphtronic monster from his hand once per turn as long as " Scopen " is in Attack Position . Leo chooses to Special Summon " Morphtronic Boomboxen , " which he tunes with " Morphtronic Scopen " to Synchro Summon " Power Tool Dragon " . Lester mocks Leo ' s move with a sneer of " " Synchro Monster ? That ' s why you ' re no good ! " " As Leo fumes and " Power Tool Dragon " roars irritably , Yusei looks on in worry . Jack wonders what ' s Leo thinking ; Synchro Monsters won ' t do any good against Lester ' s Machine Emperor . Luna calls out Leo ' s name , but Leo ignores it as he plays " Speed Spell - Summon Speeder " . Since his SPCs are above 4 , he can Special Summon a level 4 or lower monster from his hand . Leo chooses to Special Summon the level 1 " Morphtronic Vacuumen " to the field in Defense position - he explains that while in Defense mode , " Morphtronic Vacuumen " can equip a monster on the opponent ' s field to itself . Crow realizes that Leo plans to get " Machine Emperor Skiel Infinity " off the field , leaving Lester open to " Power Tool Dragon ' s " attacks . Accordingly , Leo announces that he ' s equipping " Machine Emperor Skiel Infinity " to " Morphtronic Vacuumen " . As " Morphtronic Vacuumen " opens up its vacuum and sucks " Skiel " towards it , Lester reveals the face - down Trap card , " Convert Ghost " - when a monster on his field is selected as an effect ' s target , this card can change the target to a monster in his Graveyard . Leo gasps in surprise as a monster in Lester ' s Graveyard comes out of his Duel Disk and flies into the vacuum instead . Akiza gasps in shock as Lester says Leo ' s simple plans just won ' t work on him . As both twins glare at their opponent , Leo places a card face - down in his Spell / Trap card zone , and ends his turn . Lester smugly begins his turn , prompting Leo to activate the Trap he just Set : " Power Break " , which returns all equipped or absorbed cards back to their owner ' s decks ; then , for each card returned , it inflicts 500 points of damage to the opposing player . As Lester gapes in shock , the vacuum on " Morphtronic Vacuumen " lifts up , spitting Lester ' s monster back into his deck - meanwhile , " Ancient Fairy Dragon " comes out of " Machine Emperor Skiel Infinity " , much to Luna ' s joy . With its absorbee gone , " Skiel ' s " attack points return to its original 2200 . Lester himself groans in pain as he takes 1000 points of damage , leaving his Life Points at 2200 . Leo tells Lester he ' d never let him have " Ancient Fairy Dragon " . He declares , " " I ' m not a Signer , but Luna , who does have a Signer Birthmark , is my pride and joy ! I will protect Ancient Fairy Dragon , who is the proof of that ! " " ( In the dub version , Leo said , " " I warned you to stay away from my sister , Lester , but you wouldn ' t listen ! Well , now you see - not only am I going to protect her with all of my might , but I ' ll also protect the things that she holds dear ! Don ' t mess with my sister ! " " ) Luna is touched by Leo ' s words as the rest of their friends look on . Jack comments that Leo got " Ancient Fairy Dragon " back , while Crow says that it was Leo ' s plan all along . Akiza and Yusei are equally impressed - elsewhere , Jakob and Primo observe in silence . Infuriated by the loss of " Ancient Fairy Dragon " , Lester clenches his fist , declaring , " " Now you ' ve done it ! I ' m going to pound the snot out of you ! You ' ll regret ever making me mad ! " " He activates Speed World 2 ' s effect paying 7 SPC ' s to draw one more card ; next , he reveals the face - down Trap card " Sky A3 " , which allows him to release " Skiel Attack " to Special Summon " Skiel Attack 3 " from his hand . As he does so , " Machine Emperor Skiel Infinity " gains a new cannon , its ATK rising to 2400 . Leo comments it powered up , but Lester isn ' t finished - he releases " Skiel Attack 3 " in order to Special Summon " Skiel Attack 5 " , giving " Skiel " an even stronger gun that boosts its ATK to 2600 ! As Yusei asks aloud how many times the Machine Emperor will power up , Lester activates " Skiel Attack 5 ' s " effect ; now , it can attack Leo directly . ( As " Skiel " powers up its cannon , Lester yells " DIE ! " , which is removed in the dub ) . The avian automaton fires a massive red beam at Leo , which destroys all of Leo ' s monsters and blows Leo himself right off the circuit as his Life Points drop to 0 . Luna instantly stops and screams Leo ' s name as everyone else gasps - suddenly their Marks of the Dragon begin to glow . To everyone ' s surprise , the Crimson Dragon appears , using a bubble of red energy to stop Leo from falling . Yusei yells Leo ' s name as the bubble sets him down softly . As the Crimson Dragon disappears , Akiza says Leo ' s safe , while Crow says the Crimson Dragon saved him . Yusei yells Luna ' s name and tells her Leo is safe . Luna says " " Everyone " " , and then closes her eyes for a minute , smiling with relief . Luna then puts her hand on her heart and says " " But what was that . . . that feeling I felt from my heart ? " " ( in another sub , she said " " But what was that . . . that feeling that caught my heart beat ? " " In the dub version , Luna said " " Thank goodness for the Crimson Dragon , he ' ll always save the day . " " ) . Lester irritably says " " Tch , look at him , narrowly escaping death ! " " Saying that he won ' t let that happen again , he vows to defeat Luna , and Luna alone . As Lester plays a card face - down and ends his turn , Luna gets angry , vowing to avenge Leo ' s defeat . On her turn , she summons " Regulus " and activates the Trap card " Ancient Sunshine " . Luna explains that when " Regulus " is on the field , she can remove " Ancient Fairy Dragon " from the game to inflict 2100 points of direct damage to her opponent . As the horn of " Regulus " turns yellow , Jack states that Lester will only have 100 Life Points left if the effect goes through . However , Lester smiles and reveals a Trap of his own : " Infinity Force " . He explains when a monster with " Infinity " in it ' s name is on his field , he can negate effect damage from an opponent ' s card effect and destroy all monsters on their field . Luna gasps as " Regulus " fires a yellow beam out of its horn , which Lester ' s trap absorbs . After the card receives the attack , it fires white beams at Luna ' s monsters , destroying them . Lester laughs , announcing that Luna is out of options . As Luna looks at her deck , Lester commands " Machine Emperor Skiel Infinity " to attack Luna directly . Luna gasps in fright and Yusei yells her name as " Skiel " launches its attack . As the beam approaches Luna , something begins pushing it back , surprising the Three Pure Nobles . As Primo demands to know what ' s happening , Luna uncovers her face to discover that " Kuribon " and her other Duel Spirits are trying to hold the attack back . Unfortunately , they are unable to overcome " Skiel ' s " power and the beam hits Luna , reducing her Life Points to 0 . Yusei yells Luna ' s name as she comes out of the smoke , barely keeping her balance and wobbling all over the place . Just as she ' s about to hit some glass , an image of " Regulus " pushes her out of the way , to which Luna thanks him . The others smile with relief that she ' s okay , as her Duel Board comes to a stop . Annoyed by Luna ' s survival , Lester takes his leave as Luna thanks Regulus and the other spirits for helping her . After the duel . Accompanied by their friends , the twins backtrack to Lester ' s mansion , but it has vanished . Leo and Luna are bewildered , especially when they ask Bob about Lester and find he has no recollection of meeting anyone with that name . Crow comments that they ' ve seemingly gotten caught up with a group of strange people . Akiza and Yusei agree , but Jack declares that he doesn ' t care who it is ; they will get crushed , courtesy of himself ! The episode ends with Yusei thinking to himself , " " In order to fight them , I have to complete it quick . . . a Synchro Summon that surpasses Synchros : Accel Synchro ! " " Featured Duel : Leo and Luna vs . Lester . Turn 3 : Leo Lester has just managed to Special Summon his " Machine Emperor Skiel ∞ " and its corresponding parts : " Skiel Top " , " Skiel Attack " , " Skiel Guard " , and " Skiel Carrier " . Leo set s " Morphtronics , Scramble ! " . He intends to activate " Morphtronics , Scramble ! " when " Machine Emperor Skiel ∞ " attacks him directly , which will negate the attack and Special Summon a Morphtronic monster from his hand . Turn 4 : Lester Lester draws . During the Standby Phase , the effect of " Speed World 2 " activates ( Luna ' s SPC : 2 → 3 ; Lester ' s SPC : 2 → 3 ; Leo ' s SPC : 2 → 3 ) . Lester then activates his face - down " Trap Stun " to negate the effects of all other Trap Card s this turn . " Machine Emperor Skiel ∞ " then attack s Leo directly ( Leo 4000 → 1800 ) , Lester sets a card . Turn 5 : Luna Luna draws . During the Standby Phase , the effect of " Speed World 2 " activates ( Luna ' s SPC : 3 → 4 ; Lester ' s SPC : 3 → 4 ; Leo ' s SPC : 3 → 4 ) . Luna Normal Summon s " Sunlight Unicorn " ( 4 / 1800 / 1000 ) in Attack Position . She then activates the effect of " Spore " to remove from play " Nettles " from her Graveyard and revive " Spore " ( 1 / 400 / 800 ) in Attack Position as well as increase the Level of " Spore " by the Level of " Nettles " ( " Spore " : 1 → 3 ) . Luna tunes " Sunlight Unicorn " with " Spore " in order to Synchro Summon " Ancient Fairy Dragon " ( 7 / 2100 / 3000 ) in Attack Position . She then activates the effect of " Ancient Fairy Dragon " to Special Summon " Fairy Archer " ( 3 / 1400 / 600 ) from her hand in Defense Position , however Luna will be forbidden from conducting her Battle Phase this turn . She then activates the effect of " Fairy Archer " to inflict 400 damage to Lester for each LIGHT monster s she control s ( Lester 4000 → 3200 ) . Luna then sets two cards . Turn 6 : Lester Lester draws . During the Standby Phase , the effect of " Speed World 2 " activates ( Luna ' s SPC : 4 → 5 ; Lester ' s SPC : 4 → 5 ; Leo ' s SPC : 4 → 5 ) . Lester activates the effect of " Machine Emperor Skiel ∞ " to equip itself with " Ancient Fairy Dragon " and increase its ATK by the ATK of " Ancient Fairy Dragon " ( " Machine Emperor Skiel ∞ " : 2200 → 4300 / 0 ) . He then activates " Speed Spell - Summon Close " to send " Absurd Stealer " from his hand to the Graveyard and draw one card as well as prevent both Luna and Leo from Special Summon ing any monsters for the rest of the turn . " Machine Emperor Skiel ∞ " attacks Leo directly , but Luna activates her face - down " Twinkle Wall " to negate the attack and inflict damage to herself equal to half the ATK of " Machine Emperor Skiel ∞ " ( Luna 2500 → 350 ) . Lester sets a card . Turn 7 : Leo Leo draws . During the Standby Phase , the effect of " Speed World 2 " activates ( Luna ' s SPC : 5 → 6 ; Lester ' s SPC : 5 → 6 ; Leo ' s SPC : 5 → 6 ) . Leo Normal Summons " Morphtronic Scopen " ( 3 / 800 / 1400 ) in Attack Position . He then activates the Attack Position effect of " Morphtronic Scopen " to Special Summon " Morphtronic Boomboxen " ( 4 / 1200 / 400 ) from his hand in Attack Position . Leo then tunes Morphtronic Boomboxen " with " Morphtronic Scopen " in order to Synchro Summon " Power Tool Dragon " ( 7 / 2300 / 2500 ) in Attack Position . Leo then activates " Speed Spell - Summon Speeder " to Special Summon " Morphtronic Vacuumen " ( 1 / 0 / 0 ) in Defense Position . Leo activates the Defense Position effect of " Morphtronic Vacuumen " to equip itself with " Machine Emperor Skiel ∞ " , but Lester activates his face - down " Convert Ghost " to change the target of the effect of " Morphtronic Vacuumen " to the " Absurd Stealer " in Lester ' s Graveyard ( " Convert Ghost " also treats " Absurd Stealer " as a monster on his field without it counting towards his 5 Monster Card Zone limit ) . Leo sets a card . Turn 8 : Lester Lester draw s . During the Standby Phase , the effect of " Speed World 2 " activates ( Luna ' s SPC : 6 → 7 ; Lester ' s SPC : 6 → 7 ; Leo ' s SPC : 6 → 7 ) . Since Leo controls " Power Tool Dragon " , he activates his face - down " Power Break " to return all Equip Spell Card s on the field to their owners ' Deck s ( " Machine Emperor Skiel ∞ " : 4300 → 2200 / 0 ) and inflict 500 damage to Lester for each card returned this way ( Lester 3200 → 2200 ) . Lester activates the effect of " Speed World 2 " to remove seven Speed Counters ( Lester ' s SPC : 7 → 0 ) and draw one card . Lester activates his face - down " Sky A3 " to send " Skiel Attack " to the Graveyard ( " Machine Emperor Skiel ∞ " : 2200 → 1200 / 0 ) and Special Summon " Skiel Attack 3 " ( 3 / 1200 / 0 ) in Attack Position ( " Machine Emperor Skiel ∞ " : 1200 → 2400 / 0 ) . Lester then Tributes " Skiel Attack 3 " ( " Machine Emperor Skiel ∞ " : 2400 → 1200 / 0 ) in order to Special Summon " Skiel Attack 5 " ( 5 / 1400 / 0 ) from his hand in Attack Position ( " Machine Emperor Skiel ∞ " : 1200 → 2600 / 0 ) . Due to the effect of " Skiel Attack 5 " , all of Lester ' s monsters can attack directly . " Machine Emperor Skiel ∞ " then attacks Leo directly ( Leo 1800 → 0 ) . As Leo is defeated , his face - down " Morphtronics , Scramble ! " , " Morphtronic Vacuumen " , and " Power Tool Dragon " are destroyed . Lester sets a card . Turn 9 : Luna Luna draws . During the Standby Phase , the effect of " Speed World 2 " activates ( Luna ' s SPC : 7 → 8 ; Lester ' s SPC : 0 → 1 ) . Luna Normal Summons " Regulus " ( 4 / 1700 / 1000 ) in Attack Position . Since Luna controls " Regulus " , she activates her face - down " Ancient Sunshine " to remove from play " Ancient Fairy Dragon " from her Extra Deck and inflict 2100 damage to Lester , but Lester activates his face - down " Infinity Force " to reduce the effect damage he takes to 0 and destroy all monsters that Luna controls . Turn 10 : Lester Lester draws . During the Standby Phase , the effect of " Speed World 2 " activates ( Luna ' s SPC : 8 → 9 ; Lester ' s SPC : 1 → 2 ) . " Machine Emperor Skiel ∞ " attacks directly ( Luna 350 → 0 ) . Card creation contest . At the end of the credits , it was shown that " Morphtronic Vacuumen " was chosen to become a card in the anime as a result of a drawing competition . Featured cards . The following cards appeared in this episode . Cards in italics debuted here .