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{{Infobox/Yu-Gi-Oh!/Episodeepisode | series image = Yu-Gi-Oh! GX | season = 4 | image name = Series167Jaden talks to Crowler after winning their Duel.jpgpng | image size = | image caption = | english = | kanji ja_name = 恩返しデュエル！クロノスVS元祖ドロップアウト・ボーイ | romaji romaji_name = Ongaeshi Dyueru! Kuronosu Basasu Kanzo Doroppuauto BōiBō | japanese translated ja_trans_name = Gratitude Thank-You Duel! Cronos vs Versus the Original Dropout Drop-Out Boy | episode series = Yu-Gi-Oh! GX| number = 167 | japanese air date season = 4| ja_air_date = December 26, 2007 | english air date ja_opening = | japanese opening = [[Precious Time, Glory Days]] | japanese ending ja_ending = [[Endless Dream]] | featured card featured_card = Ultimate Ancient Gear Golem(anime)| screenwriter = Koji Ueda

'''"Gratitude Thank-You Duel! Cronos vs. Versus the Original Dropout Drop-Out Boy"''' is the one hundred and sixty-seventh episode of the ''[[Yu-Gi-Oh! GX]]'' anime. It first aired in Japan on December 26, 2007.

{{episode summary|With graduation approaching, [[Vellian Crowler|Dr. Crowler]] begins to revert to his old ways, and [[Jaden Yuki|Jaden]] [[Duel]]s him to find out why.}}

{{incomplete}}[[Tyranno Hassleberry|Hassleberry]] and [[Blair Flannigan|Blair]] have finished the graduation album photos and hand the [[Wikipedia:USB flash drive|flash drive]] containing them to [[Vellian Crowler|Dr. Crowler]]. He previews the photos, and privately seems upset that everyone is growing up and leaving [[Duel Academy]]. Meanwhile, [[Jaden Yuki|Jaden]] has been skipping classes again, and Hassleberry and Blair inform him that Crowler's manner has changed. He chastises the third year students, making them do tests in basic math to ensure they can calculate [[Life Points]], write [[Wikipedia:Kanji|Chinese text]] to understand [[card effect]]s, and even makes them do [[Wikipedia:Press-up|push-ups]]. He then begins canceling classes, and the students begin to fear that they won't have sufficient grades to graduate if he keeps doing so.

Crowler goes to great lengths to hide from his students, and this ultimately results in a chase across the Academy, even leading them through [[Chancellor Sheppard]]'s office. They finally corner him, and he states he won't allow them to graduate. Jaden asks why, and Crowler reveals that Jaden himself does not have sufficient points to graduate and even calls him "drop-out boy", something he hadn't done in long time (This expression is usually changed to "Slifer Slacker" in the dub). Jaden challenges Crowler to a Duel, and the latter accepts, with him promising to allow everyone to graduate should Jaden defeat him.

Jaden Summons "[[Elemental Hero Flame Wingman (later anime)|Elemental Hero Flame Wingman]]" early onin his first turn. Crowler expects this, and [[Removed remove from play|removesfrom play]] it form play "Flame Wingman" using his "[[Unfinished Time Box]]" [[Trap Card]]when "Flame Wingman" destroys his "[[Ancient Gear Soldier (anime)|Ancient Gear Soldier]]". He then successfully Summons three 3 "[[Ancient Gear Golem(later anime)|Ancient Gear Golems]]s" and reduces Jaden's [[Life Points]] to 200, thanks to their [[Piercing]] effects. Jaden comments that Crowler is a great teacher, and thanks him for showing him such an awesome combo. He strikes back using "[[Elemental Hero Flare Neos (anime)|Elemental Hero Flare Neos]]" and "[[Instant Neo Space (later anime)|Instant Neo Space]]". At this point, Crowler breaks down crying, and reveals that he doesn't want them the seniors to graduate as he will miss them. Many of the students even begin cheering for Crowler, telling him not to give up. Crowler unveils his most powerful monster - "[[Ultimate Ancient Gear Golem (anime)|Ultimate Ancient Gear Golem]]", with an attack of 4400. Despite being reduced 100 Life Points, Jaden still appears optimistic, and Crowler himself wishes to see how Jaden will turn the situation around and defeat him.

Jaden doesshows him just that, by freeing his "[[Elemental Hero Flame Wingman|Flame Wingman]]" from "Unfinished Time Box" with a combination of "[[Elemental Hero Air Neos (anime)|Elemental Hero Air Neos]]" and "[[Cyclone Wing]]". He activates "[[Demise of the Land (anime)|Demise of the Land]]", which lets him activate "[[Skyscraper (later anime)|Skyscraper]]" in the middle of his [[Battle Phase]], and destroying Crowler's "[[Ancient Gear Golem]]" with "Elemental Hero Flame Wingman", winning the this Duel the same way he won their [[Yu-Gi-Oh! GX - Episode 001|previous first Duel]]. Crowler comments that he's learned just as many things from his students as they've hopefully learned from hishim. He realizes that he need to move forward as a teacher, much like the graduates. With this, Crowler begins teaching classes again, but forces Jaden to do all the work he's missed in his skipped classes.

==Featured Duel - : Jaden Yuki vs. Vellian Crowler vs Jaden==

* Crowler draws "Unfinished Time Box". He then [[Normal Summon|Summons]] s "[[Ancient Gear Soldier (anime)|Ancient Gear Soldier]]" (1300/1300) in [[Defense Position]]* and [[Set]]s a card.

* [[Activate]]s Jaden draws "[[Polymerization (anime)|Polymerization]]" and fuses [[Elemental Heroes]] subsequently activates it to fuse "[[Elemental Hero Avian(anime)|Elemental Hero Avian]]" and with "[[Elemental Hero Burstinatrix(anime)|Elemental Hero Burstinatrix]]", in order to [[Fusion Summon|forming]] "[[Elemental Hero Flame Wingman (later anime)|Elemental Hero Flame Wingman]]" (2100/1200), in [[Attack Position]].* "[[Elemental Hero Flame Wingman|Flame Wingman]]" attacks and destroys "[[Ancient Gear Soldier]]". Since "Flame Wingman" destroyed a monster by battle and sent it to the Graveyard, with Crowler taking takes [[effect damage|damage]] equal to his destroyed monster's [[ATK]] (Crowler: 4000 → 2700).* Crowler then activates his face-down "[[Unfinished Time Box]]", which to [[Removed banish|remove from play|removes]] "[[Elemental Hero Flame Wingman|Flame Wingman]]" from play—since it destroyed and draw one of Crowler's monsters this turn—and also lets Crowler card ("[[draw a cardAncient Gear Golem (later anime)|Ancient Gear Golem]]").* Jaden Normal Summons "[[Elemental Hero Clayman (anime)|Elemental Hero Clayman]]" (800/2000) in [[Defense Position]].

* Activates Crowler draws. He then activates "[[Crazy Summon Gear]]", selecting to target "[[Elemental Hero Clayman|Clayman]]": this forces and the "Ancient Gear Soldier" in his Graveyard and force Jaden to Special Summon two monsters from his Deck with the same type as "Clayman" while Crowler can Special Summon all monsters with the same name as the targeted monster in his Graveyard. Jaden Special Summons "[[Elemental Hero Sparkman (anime)|Elemental Hero Sparkman]]" (1600/1400) in Attack Position and "[[Elemental Hero Wildheart (anime)|Elemental Hero Wildheart]]" (1500/1600) in [[Defense Position]] from his [[Main Deck|Deck]] and also allows , while Crowler to Summon the revives "[[Ancient Gear Soldier]]" (1300/1300) in from his [[Graveyard]] in Attack Position and 2 Special Summons two more copies "Ancient Gear Soldiers" from his Deckin Attack Position.* Activates [[File:3AncientGearGolems Crowler.png|left|200px|thumb|[[Vellian Crowler|Crowler]] with three "[[Spell Ancient Gear Golem (later anime)|Ancient GearGolem]]s", sending his 3 .]]Crowler then activates "[[Ancient Spell Gear (anime)|Spell Gear Soldier]]s" to send his three "Ancient Gear Soldiers" to the Graveyard and Special Summoning 3 Summon two "[[Ancient Gear Golem]]sGolems" (3000/3000) in their place, one from his [[Main Deck|Deck]] and two one "Ancient Gear Golem from his [[hand]]in Attack Position, ignoring the [[summoning conditions]].<ref group=Notes name=spellgear>In the ''TCG''/''OCG'', The three "[[Spell Ancient Gear]]Golems" attack and destroy "Clayman" can only Summon up to 2 , "[[Ancient Gear Golem]]sWildheart", and any 3 "[[Ancient Gears|Ancient Gear]]Sparkman" card can be [[send|sent]] from . Two of the [[field]] to the [[Graveyard]] for its [[effect]].</ref>* The 3 "[[Ancient Gear Golem]]sGolems" attack and destroy then inflict piercing damage to Jaden's monsters, while inflicting [[Piercing]] damage on his [[Defense Position]] monsters (Jaden: 4000 → 3000 → 1600 → 200).* Sets Crowler sets a card.

* Sends Jaden draws "[[Take Over Five]]" and subsequently activates it by sending the top 5 five cards of his Deck ("[[Elemental Hero Necroshade (anime)|Elemental Hero Necroshade]]", "[[Elemental Hero Neos (anime)|Elemental Hero Neos]]", "[[Neo-Spacian Flare Scarab (anime)|Neo-Spacian Flare Scarab]]", "[[Necro Gardna (anime)|Necro Gardna]]" and "[[Hero Signal (later anime)|Hero Signal]]") to the Graveyard to activate "[[Take Over 5]]". During his [[Standby Phase]], he may remove this card in the Graveyard from play to draw a card. In addition, while While "[[Take Over 5]]Five" is in the Jaden's Graveyard, he is immune to effects that send cards from his Deck to the Graveyard.* Activates Jaden then activates "[[Miracle Contact (anime)|Miracle Contact]]", returning to return "[[Elemental Hero Neos]]" and "[[Neo-Spacian Flare Scarab]]" from his Graveyard to his Deck, and [[Special Summon]]ing "[[Elemental Hero Flare Neos (anime)|Elemental Hero Flare Neos]]" (2500/2000) in Attack Position.* [[Equip]]s Jaden then activates "[[Elemental Hero Flare NeosInstant Neo Space (later anime)|Flare Neos]]" with "[[Instant Neo Space]]", allowing and equips it to remain on the field instead of returning "Flare Neos". Now "Flare Neos" does not have to return to his Jaden's Fusion Deck at during the [[End Phase]]due to its own effect.* Due to the effect of "[[Elemental Hero Flare Neos|Flare Neos]]" also , it gains 400 additional ATK for each [[Spell Card|Spell]] and [[Trap Card]] on the field, and there are 3. currently three ("Flare Neos": 2500 → 3700/2000)* . "[[Elemental Hero Flare Neos|Flare Neos]]" attacks and destroys 1 one of Crowler's "[[Ancient Gear Golem]]sGolems" (Crowler: 2700 → 2000).

* Activates Crowler draws. He then activates "[[Ancient Gear Workshop (anime)|Ancient Gear Workshop]]", returning to return the "[[Ancient Gear Golem]]" in his Graveyard to his hand.* Activates He then activates "[[Polymerization]]", fusing to fuse the "[[Ancient Gear Golem]]" in this his hand with and the two other 2 on the his field together in order to [[Fusion Summon]] "[[Ultimate Ancient Gear Golem (anime)|Ultimate Ancient Gear Golem]]" (4400/3400) in Attack Position.* "[[Ultimate Ancient Gear Golem]]" attacks "[[Elemental Hero Flare Neos|Flare Neos]]", with but Jaden [[banish|removing removes from play]] the "[[Necro Gardna]]" in from his Graveyard via its own effect to [[negate]] the attack.* Activates Crowler activates his face-down "[[Desperado Desperate Battle]]", reducing to reduce the ATK of "[[Ultimate Ancient Gear Golem]]'s" ATK by 1000 for the duration of the turn ("Ultimate Ancient Gear Golem": 4400 → 3400/3400) and allowing allow it to attack again.* ("[[Elemental Hero Flare Neos]]" loses 400 [[ATK]], since "[[Desperado Battle]]" is no longer on the field (: 3700 → 3300/2000)* . "[[Ultimate Ancient Gear Golem]]" attacks and destroys "[[Elemental Hero Flare Neos|Flare Neos]]" (Jaden: 200 → 100).* With The last effect of "[[Elemental Hero Flare Neos|Flare Neos]]" having left the field while equipped with "[[Instant Neo Space]]"then activates, letting Jaden can now [[Special Summon]] "[[Elemental Hero Neos]]" (2500/2000) from his Deckin Attack Position. On Crowler's End Phase, the effect of "Desperate Battle" expires ("Ultimate Ancient Gear Golem": 3400 → 4400/3400).

* Draws Jaden draws "[[Demise of the Land]]".* During his Jaden's [[Standby Phase]], Jaden also he removes the from play "[[Take Over 5]]Five" in from his Graveyard from play in order to draw a card.* Activates ("[[Fifth Hope (anime)|Fifth Hope]]", shuffling ). He then activates "Fifth Hope" to return "[[Elemental Hero Avian|Avian]]", "[[Elemental Hero Burstinatrix|Burstinatrix]]", "[[Elemental Hero Sparkman|Sparkman]]", "[[Elemental Hero Clayman|Clayman]]" and "[[Elemental Hero Wildheart|Wildheart]]" back into from his Graveyard to his Deck to and draw two cards.* Summons ("[[Neo-Spacian Air Hummingbird (anime)|Neo-Spacian Air Hummingbird]]" and "Cyclone Wing").  Jaden then Normal Summons "Neo-Spacian Air Hummingbird" (800/600)in Attack Position.* Returns He then Contact Fuses "[[Elemental Hero Neos|Neos]]" and with "[[Neo-Spacian Air Hummingbird|Air Hummingbird]]" from the field in order to his Deck, Special Summoning Summon "[[Elemental Hero Air Neos (anime)|Elemental Hero Air Neos]]" (2500/2000) in Attack Position.* "Since Jaden's [[Elemental Hero Life Points]] are lower than Crowler's, "Air Neos|Air Neos]]" gains [[ATK]] equal to the difference in due to its own effect ("Elemental HERO Air Neos": 2500 → 4400/2000). Jaden then activates "[[Life PointsCyclone Wing]] between Jaden " and Crowler, which is 1900equips it to "Air Neos". (4400/2000)* Equips Now when "Air Neos" with "attacks, one [[Spell Card|Spell]]/[[Cyclone WingTrap Card|Trap]]"on the opponent's side of the field can be destroyed.* "Air Neos" attacks "[[Ultimate Ancient Gear Golem]]", destroying both monsters, but also activating . Jaden activates the effect of "[[Cyclone Wing]]", which lets Jaden to destroy one Spell or Trap Card on the field"Unfinished Time Box". The final effect of "Unfinished Time Box" is targeted and destroyedthen activates, which returns returning "[[Elemental Hero Flame Wingman]]" (2100/1200) to Jaden's side of the field in Attack Position. "Air Neos" and under Jaden's control"Ultimate Ancient Gear Golem" then destroy each other in a [[Double KO]].* The Crowler then activates the final effect of "[[Ultimate Ancient Gear Golem]]" also activates upon being destroyed, to Special Summoning the original Summon "[[Ancient Gear Golem]]" (3000/3000) from the his Graveyardin Attack Position, ignoring the Summoning conditions.* Activates Jaden activates "[[Demise of the Land (anime)|Demise of the Land]]" (since Crowler Special Summoned a monster): This allows him to activate a "[[Field Spell CardSkyscraper (later anime)|Skyscraper]] " from his Deck. Now if an Elemental Hero attacks, and he chooses "[[Skyscraper]]"it will gain 1000 ATK during damage calculation only.* "[[Elemental Hero Flame Wingman|Flame Wingman]]" attacks "[[Ancient Gear Golem]]", with . The effect of "Skyscraper" activates ("Flame Wingman" gaining 1000 extra ATK from : 2100 → 3100/1200). "[[Skyscraper]]Flame Wingman" and destroying destroys "Ancient Gear Golem" (Crowler: 2000 → 1900).* The effect of "[[Elemental Hero Flame Wingman|Flame Wingman]]" inflicts damage to Crowler equal to his destroyed monster's ATK activates (Crowler: 1900 → 0).* Jaden wins.

|normal monsters =<u>Normal Monsters</u>* [[Elemental Hero Avian (anime)|Elemental Hero Avian]]* [[Elemental Hero Burstinatrix (anime)|Elemental Hero Burstinatrix]]* [[Elemental Hero Clayman (anime)|Elemental Hero Clayman]]* [[Elemental Hero Neos (anime)|Elemental Hero Neos]]* [[Elemental Hero Sparkman (anime)|Elemental Hero Sparkman]]<u>Effect Monsters</u>|effect monsters =* [[Elemental Hero Necroshade (anime)|Elemental Hero Necroshade]]* [[Elemental Hero Wildheart (anime)|Elemental Hero Wildheart]]* [[Necro Gardna (anime)|Necro Gardna]]* [[Neo-Spacian Air Hummingbird (anime)|Neo-Spacian Air Hummingbird]]* [[Neo-Spacian Flare Scarab (anime)|Neo-Spacian Flare Scarab]]<u>Fusion Monsters</u>|fusion monsters =* [[Elemental Hero Air Neos (anime)|Elemental Hero Air Neos]]* [[Elemental Hero Flame Wingman (later anime)|Elemental Hero Flame Wingman]]* [[Elemental Hero Flare Neos (anime)|Elemental Hero Flare Neos]]

* ''[[Demise of the Land (anime)|Demise of the Land]]''* [[Fifth Hope (anime)|Fifth Hope]]* [[Instant Neo Space (later anime)|Instant Neo Space]]* ''[[Miracle Contact (anime)|Miracle Contact]]''* [[Polymerization (anime)|Polymerization]]* [[Skyscraper (later anime)|Skyscraper]]* ''[[Take Over 5Five]]''

* [[Hero Signal (later anime)|Hero Signal]]

|effect monsters =<u>Effect Monsters</u>* [[Ancient Gear Golem (later anime)|Ancient Gear Golem]] x3* [[Ancient Gear Soldier (anime)|Ancient Gear Soldier]] x3<u>Fusion Monsters</u>|fusion monsters =* ''[[Ultimate Ancient Gear Golem (anime)|Ultimate Ancient Gear Golem]]''

* ''[[Ancient Gear Workshop (anime)|Ancient Gear Workshop]]''

* [[Polymerization (anime)|Polymerization]]* ''[[Spell Gear (anime)|Spell Gear]]''

* ''[[Desperado Desperate Battle]]''

|effect monsters =<u>Effect Monsters</u>* [[Ancient Gear Golem (later anime)|Ancient Gear Golem]]<u>Fusion Monsters</u>|fusion monsters =* [[Elemental Hero Flame Wingman (anime)|Elemental Hero Flame Wingman]]