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{{Infobox/Yu-Gi-Oh!/Episodeepisode | series = Yu-Gi-Oh! ZEXAL | season = 2 | image name = prev.png | image caption = | english en_name = Memory Thief: Part 1 | kanji ja_name = 純真なる決闘者！ ｢先史遺産｣始動！！ | ruby japanese = | romaji romaji_name = Junshin-naru Dyuerisuto! Ōpātsu Shidō!! | japanese translated ja_trans_name = A Pure-Hearted Duelist! Start Up the OOPArts!! | episode number = 112 | japanese air date ja_air_date = July 14, 2013 | english air date en_air_date = May 31, 2014 | japanese opening ja_opening = [[Dual-ism of Mirrors]] | japanese ending ja_ending = [[GO WAY GO WAY]] | english opening en_theme = [[Halfway to Forever]] | english ending featured_card = | featured card screenwriter = Gō Zappa | screenwriter = | director = | storyboard artist storyboard_artist = [[Gill Bo No]]

"'''Memory Thief: Part 1'''", known as "'''A Pure-Hearted Duelist! Start Up the OOPArts!!'''" in the Japanese version, is the one hundredth hundred and twelve twelfth episode of the ''[[Yu-Gi-Oh! ZEXAL]]'' anime. It first aired in Japan on July 14, 2013 and in the United States on May 31, 2014.

At Thousand's palace, [[Mr. Heartland]] yells his signature "Fly Burning!" catchphrase. He says he came to Vector just as he asked. Vector scolds Heartland for being late. Heartland notices the set of armor binding Vector to his throne and wonders why Vector has it. Before Heartland can continue, Vector grabs Heartland, encasing him in energy. This transforms Heartland back into his human form, albeit without any clothes (only the first shot of the naked Heartland is retained in the dub; the others were cut). Glowing with a magenta aura, Heartland thanks "Lord" Vector for turning him back. Vector gives Heartland an assignment in return for turning him back to a human. Heartland gladly agrees and dons a white suit. Vector gives Heartland a card, telling him to use it to take Yuma's "Numbers". When Heartland looks at it, he exclaims that it is "[[Number 1: Infection Baal ZebulBuzz King (anime)|Number 1]]" and cannot believe that Vector would give him a valuable card (in the original, the number is the only glimpse of the card; in the dub, its full artwork can be seen). Vector also gives Heartland subordinates to help him. Three cloaked figures appear behind them. Heartland recognizes them and one of the figures steps forward. He chuckles and says the [[Fearsome Four of the Dark Dueling World]] is teaming up again. Then he throws off his cloak, revealing himself as [[Erazor]]. Heartland is surprised that Erazor is working for him again. He kneels down to Vector and says they will not fail him. He and Erazor disappear.

Yuma is still frustrated, but Heartland tells his subordinate to hold on. There is no need to pressure Yuma so much. He tells Yuma to think carefully--the "Number" war is an issue between the Astral and [[Barian World]]s. It should have nothing to do with a human like Yuma. Now that Astral is gone, there is no reason for Yuma to protect the "Numbers". Yuma starts to answer, but Heartland leans in close and proposes a solution. If Yuma gives him the "Numbers", Heartland will no longer bother him and his friends. Their memories will be also returned. Heartland even offers to erase the memories pertaining to Astral because the thought of losing him is painful. It would be natural for Yuma to retain the pleasant memories of Astral, though. If all memories of Astral are erased, Yuma will return to the calm, peaceful world he knew before he met Astral. Yuma starts to consider Heartland's offer as he reaches for his Deck box. Before he can give it to Heartland, Yuma says he cannot do it. Heartland is confused and various "Numbers" appear in spirit above Yuma as he declares that while it is true he has nothing to do with the Astral and Barian Worlds, the "Numbers" are something Astral left with him. To them, the "Numbers" represent the things they spent fighting for; therefore, they cannot be just given to other people like Heartland. A voice from above says Yuma is right. [[Trey]] throws a sword at Heartland, but Heartland dodges by teleporting away from Yuma. Heartland and Yuma recognize Trey.

Trey tells Yuma that he recognizes his determination because if he had the feelings to fight for what he wanted to protect, Trey will become the shield and sword to protect him (in the dub, Trey tells Yuma that if Heartland wanted to harm Yuma, they will have to go through him first). Yuma is confused and Trey informs him that he and his brothers researched the Barian and Astral Worlds. During investigation, they learned that Yuma lost Astral. Trey admits that Yuma is the first friend Yuma met; because of this, he cannot ignore his sadness. Heartland scoffs at the reunion and asks Trey what he, his brothers and [[Vetrix|their father]] could possibly do (in the dub, Heartland says he is up against two runts). Trey responds that they will crush "some comical fly wearing glasses". Heartland curses and sends a swarm of flies from his cane at Trey, but Trey uses his [[crest]] bracelet to protect himself and Yuma with a pink barrier. When the flies make contact, they drop dead to the ground. Heartland is baffled that Trey can still use the power of the crests. Trey tells him that Quinton made bracelets that harnessed the power of his father's crest. Yuma mutters, "The power he gave you..." Trey turns to Yuma and says while he cannot replace Astral, he can help him Duel against Erazor and Heartland. In the past, Yuma fought Trey with his life on the line, but now Trey will fight alongside him as a friend. Yuma mutters what Trey just said before recalling the same memory of Astral entrusting the "Numbers" to him. Yuma opens his Deck case and presents Trey with "[[Number 33: Chronomaly Machu Mech (anime)|Number 33: Chronomaly Machu Mech]]" and "[[Number 6: Chronomaly Atlandis (anime)|Number 6: Chronomaly Atlandis]]". He tells him that when Astral left Yuma with the "Numbers", he may have meant to use their power justly; Yuma will split up this power with his friends and fight alongside them. Trey smiles and takes the cards. Yuma says while this may not be the best choice, this is his only answer for now (in the dub, Yuma says if Astral was here, he would have agreed with him). Erazor says Yuma and Trey appear ready to Duel. He leaps from the statue and adds that he is fine with a two-on-one Duel. Trey tells him that he will regret this decision. All three Duelists arm their [[D-Pad]]s, while Yuma dons his [[Duel Gazer]] and Trey's Duel Gazer tattoo appears around his eye. All three players yell, "Duel!"

Before the Duel starts, Heartland tells Erazor that he will flower up the battlefield. He snaps his fingers and enlarged versions of [[Don Thousand's Emblem]] appear on the ground. He chants, "My clansmen! Carve the seal of wickedness within the earth!" Yuma asks what's the meaning of this. Heartland explains that within this field, at the same time a Duel begins, Erazor can halve his opponents' [[Life PointsLP]] and add them to his own. Trey calls this a dirty tactic and Heartland agrees. He points his cane at the Number Club, calling them his opponents' problem. Heartland proceeds to prod Tori with the cane (Heartland gesturing with the cane is cut from the dub). Yuma falls on one knee, while Trey hangs on, their Life Points LP halved to 2000. Erazor laughs as his Life Points LP increase to 8000. He transforms into a humanoid cicada and releases a burst of energy that destroys the statue of Heartland, greatly upsetting the former mayor of the city that his image was ruined (Heartland bemoaning his statue's destruction is cut from the dub). Yuma mutters that this must be Erazor's true form (in the dub, Yuma mutters that he isn't liking this, while Trey agrees).

==Featured Duels=====Erazor vs. Unknown Duelist===[[Duel]] is shown from an unspecified [[turn]]. [[Erazor]] [[control]]s "[[Number 3: Cicada King (anime)|Number 3: Cicada King]]" ([[File:Rank Star.svg|16px]]3/1200/2500) in Attack Position (but it is silhouetted), while his opponent controls no cards and has 800 [[LP]]. <u>'''Erazor's turn'''</u><br />Earzor's opponent's LP are [[damage]]d through unknown means (Opponent: 800 → 0 LP). ===Yuma Tsukumo & and Trey vs. Erazor===[[File:Semimaru Erazor Vs. Yuma & Trey.png|thumb|left|The Duel begins.]]The Duel starts with every player having 4000 [[Life PointsLP]] each, but [[Mr. Heartland]] activates a '[[Barian_Emblem|field effect]]', which reduces [[Yuma Tsukumo|Yuma]]'s and [[Trey]]'s Life Points LP by half and [[Erazor]] gains Life Points LP by the total amount they lost (Yuma : 4000 → 2000LP; Trey : 4000 → 2000LP; Erazor : 4000 → 8000LP).

* [[Gagaga Magician (anime)|Gagaga Magician]]* [[Ganbara Knight (anime)|Ganbara Knight]]* [[Gogogo Golem (anime)|Gogogo Golem]]

* [[Number 6: Chronomaly Atlandis (anime)|Number 6: Chronomaly Atlandis]]* [[Number 16: Shock Master (anime)|Number 16: Shock Master]]* [[Number 17: Leviathan Dragon (anime)|Number 17: Leviathan Dragon]]* [[Number 33: Chronomaly Machu Mech (anime)|Number 33: Chronomaly Machu Mech]]* [[Number 39: Utopia (anime)|Number 39: Utopia]]

* [[Armored Xyz (anime)|Armored Xyz]]* [[Double or Nothing! (anime)|Double or Nothing!]]* [[Monster Reborn (anime)|Monster Reborn]]

* [[Half Unbreak (later anime)|Half Unbreak]]

* ''[[Number 1: Infection Baal ZebulBuzz King (anime)|Number 1: Infection Buzz King]]''

* ''[[Number 3: Cicada King (anime)|Number 3: Cicada King]]'' (silhouette)}} {{Decklist|Other|xyz monsters=* [[Number 7: Lucky Straight (anime)|Number 7: Lucky Straight]]* [[Number 10: Illumiknight (anime)|Number 10: Illumiknight]]* [[Number 17: Leviathan Dragon (anime)|Number 17: Leviathan Dragon]]* [[Number 19: Freezerdon (anime)|Number 19: Freezerdon]]* [[Number 30: Acid Golem of Destruction (anime)|Number 30: Acid Golem of Destruction]]* [[Number 34: Terror-Byte (anime)|Number 34: Terror-Byte]]* [[Number 39: Utopia (anime)|Number 39: Utopia]]* [[Number 56: Gold Rat (anime)|Number 56: Gold Rat]]* [[Number 61: Volcasaurus (anime)|Number 61: Volcasaurus]]* [[Number 83: Galaxy Queen (anime)|Number 83: Galaxy Queen]]

|xyz monstersspells =* [[Number 7: Lucky StraightSunken Kingdom]]* [[Number 10: Illumiknight]]* [[Number 17: Leviathan Dragon]]* [[Number 19: Freezadon]]* [[Number 30: Acid Golem of Destruction]]* [[Number 34: Terror-Byte]]* [[Number 39: Utopia]]* [[Number 56: Gold Rat]]* [[Number 61: Volcasaurus]]* [[Number 83: Galaxy QueenTomato Paradise (anime)|Tomato Paradise]]