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{{Infobox/Yu-Gi-Oh!/Episodeepisode | series = Yu-Gi-Oh! | season = 4 | image name = Yugioh161.jpg | image size = | image caption = png | english en_name = On the Wrong Track - Part 2 | kanji ja_name = パワーアップデッキ！ 羽蛾＆竜崎 | romaji romaji_name = Pawā Appu Dekki! Haga to Ryūzaki | japanese translated ja_trans_name = Power-Up Deck! Haga & Ryuzaki | episode number = 161 | japanese air date ja_air_date = June 24, 2003 | english air date en_air_date = November 27, 2004 | japanese opening ja_opening = [[WARRIORS]] | japanese ending ja_ending = [[These Overflowing Feelings Don't Stop]] | english opening en_theme = [[Yu-Gi-Oh! Season 1 Theme (English)|Season one theme]] | english ending screenwriter = [[Yu-Gi-Oh! Season 1 Theme (English)|Season one theme]]Atsushi Maekawa

==Featured Duels=====Featured Duel #1: Rex Raptor vs. Joey Wheeler - Part 2===

==Both players still have 4000 [[LP|Life Points]] remaining. Joey controls "Panther Warrior" (2000/1600) in Attack Position and one set card. Rex Raptor's Turn==*Draws controls "Kaitoptera" (1900/1000) and two "Gilasaurus" (1900/400) in Attack Position, "[[Spell CardThe Seal of Orichalcos (anime)|The Seal of Orichalcos]] " and one set card. <u>'''Turn 3: Rex Raptor'''</u><br />Rex draws "[[Polymerization (anime)|Polymerization]]" and subsequently [[Activateactivate]]s it, fusing to fuse "[[Kaitoptera (anime)|Kaitoptera]]" and his first with one "[[Gilasaurus (anime)|Gilasaurus]]" in order to form Fusion Summon "[[Horned Saurus (anime)|Horned Saurus]]" (2000 → 2500 [[ATK]] / 1000 [[DEF]]) in [[Attack Position]].*Since [[Joey]] has a [[Monster Cards|Monster]] in Play, "[[Giant Rex]]'s" [[Card effect|Effect]] does not apply: [[Rex Raptor|Rex]] then [[Normal Summon]]s it to the "[[Playing FieldGiant Rex (anime)|FieldGiant Rex]] " (2000 → 2500 [[ATK]] / 1200 [[DEF]]) in [[Attack Position]].*Activates "Since [[Horned SaurusJoey]]'" Effect: it can controls a [[Attack]] Joey [[Direct attackMonster Cards|Directlymonster]] , the [[Turnnegative effect]] of "Giant Rex" does not apply and it is Fusion Summoned, but the able to attack. "Horned Saurus" then attacks directly through its own effect can't be used again for the remainder of the Duel ([[Joey]]: 4000 → 1500 [[Life Points]]).*Uses "[[Giant Rex]]" to Attack attacks & [[Destroy]] destroys Joey's "[[Panther Warrior (anime)|Panther Warrior]]" ([[Joey]]: 1500 → 1000 [[Life Points]]).*Attacks Joey directly with his second "[[Gilasaurus]]"attacks directly, but Joey activates [[Quickhis face-Play Spell Card]] down "[[Scapegoat (later anime)|Scapegoat]]": he to [[Special Summon]]s 4 four "[[Sheep Token(anime)|Sheep Tokens]]s" (0 /0 for all) in [[ATKDefense Position]] . A replay occurs and "Gilasaurus" attacks and destroys Joey's first "Sheep Token". <u>'''Turn 4: Joey Wheeler'''</u><br / 0 >Joey draws. He then [[Normal Summon]]s "[[DEFRocket Warrior (anime)|Rocket Warrior]]" (1500/1300) in [[Defense Position]]and [[Set]]s two Cards.*<u>'''Turn 5: Rex Raptor'''</u><br />Rex draws. "[[Horned Saurus (anime)|Horned Saurus]]" attacks Joey's "Rocket Warrior", but Joey activates his face-down "[[Magical Arm Shield (anime)|Magic Arm Shield]]" to take [[control]] of Rex's "Gilasaurus" and makes it the new attack target of "Horned Saurus". Rex then activates his face-down "[[Jurassic Heart]]" to negate "Magic Arm Shield" and destroy it. "Horned Saurus" then destroys Joey's "Rocket Warrior". "Giant Rex" attacks and destroys Joey's first second "Sheep Token". "Gilasaurus" attacks and destroys Joey's third "[[Sheep Token]]". Rex then Sets a Card.

==<u>'''Turn 6: Joey Wheeler's Turn==''</u><br />*Joey draws"Red-Eyes B.*Dragon". He then activates "[[Normal SummonStar Blaster]]s "to Tribute his last "Sheep Token" and roll a die. The die result will be added to the Level of the Sheep Token, and then Joey can [[Rocket WarriorSpecial Summon]]a monster from his hand whose Level is the same as the total. The die result is 6, so Joey can Special Summon a Level 7 monster. He Special Summons " (1500 [[ATKRed-Eyes B. Dragon (later anime)|Red-Eyes B. Dragon]] " (2400/ 1300 [[DEF]]2000) in [[Defense Attack Position]].*[[Set]]s 2 Cards.

==Rex Raptor's Turn==*Rex draws.*Uses "[[Horned Saurus]]" to attack Joey's "[[Rocket Warrior]]", but Joey then activates [[Trap Card]] his face-down "[[Magical Arm ShieldMetalmorph (anime)|Magic Arm ShieldMetalmorph]]": he takes [[control]] of Rex's "[[Gilasaurus]]" and makes , equipping it to "[[Horned Saurus]]'" new Attack targetRed-Eyes B. *Rex replies by Activating [[Counter Trap Card]] Dragon"and increasing its [[Jurassic HeartATK]]", Negating "and [[Magical Arm Shield|Magic Arm ShieldDEF]]'sby 300 (" Effect and destroying itRed-Eyes B. Dragon"[[Horned Saurus]]" destroys Joey's "[[Rocket Warrior]]: 2400 → 2700/2000 → 2300). Now when "Red-Eyes B.*Uses "[[Giant Rex]]Dragon" to Attack and Destroy Joeyattacks an opponent's second "[[Sheep Token]]".*Uses "[[Gilasaurus]]" monster, it will gain ATK equal to Attack and Destroy Joey's third "[[Sheep Token]]".*Sets a Cardhalf the ATK of the attack target during damage calculation.

==Joey Wheeler's Turn==*Draws "Red-Eyes B. Dragon".*Activates [[Spell Card]] "[[Star Blaster]]": Joey Targets his last "[[Sheep Token]]" for this effect ([[Level]] 1) and rolls a die. The die result will be added to the Level of the Sheep Token and after that happens Joey can Tribute his Sheep Token to summon a monster from his hand whose Level is the same as the Sheep Token's. The die result is a 6, so Joey increases the Level of the Sheep Token by 6, making it a Level 7 monster. Joey then Tributes the Sheep Token to [[Special Summon]] a [[Level]] 7 Monster from his hand. Joey chooses "[[Red-Eyes B. Dragon|Red-Eyes Black Dragon]]" (2400 [[ATK]] / 2000 [[DEF]]) in [[Attack Position]].*Activates [[Trap Card]] "[[Metalmorph]]", Equipping it to "[[Red-Eyes B. Dragon|Red-Eyes Black Dragon]]": its [[ATK]]/[[DEF]] increases by 300 ("[[Red-Eyes B. Dragon|Red-Eyes Black Dragon]]": 2400 → 2700 [[ATK]] / 2000 → 2300 [[DEF]]). Also when it attacks an opponent's monster, it will gain ATK equal to half the ATK of the attack target during Damage Calculation only.*Uses "[[Red-Eyes B. Dragon|Red-Eyes Black Dragon]]" to attack Rex's "[[Horned Saurus]]": "[[Metalmorph]]'s" Effect is immediately Activated, increasing "[[Red-Eyes B. Dragon|Red-Eyes Black Dragon]]'s" [[ATK]] by half that of the ATK The effect of "[[Horned Saurus]]Metalmorph" i.e. +1250 only during [[Damage Calculation]] activates ("[[Red-Eyes B. Dragon|Red-Eyes Black Dragon]]": 2700 → 3950 [[ATK]] / 2300 [[DEF]]).*"[[Red-Eyes B. Dragon|Red-Eyes Black Dragon]]" Destroys destroys "[[Horned Saurus]]" ([[Rex Raptor]]: 4000 → 2550 [[Life Points]]).*After Damage Calculationdamage calculation, the ATK effect of "Red-Eyes B. DragonMetalmorph" goes back to normal expires ("Red-Eyes B. Dragon": 3950 → 2700 / 2300 DEF).*Joey Sets a Card.

==<u>'''Turn 7: Rex Raptor's Turn==''</u><br />*Rex draws.*He then Tributes "[[Gilasaurus]]" and "[[Giant Rex]]" in order to Tribute Summon "[[Tyrant Dragon (anime)|Tyrant Dragon]]" (2900 → 3400 [[ATK]] / 2500 [[DEF]]) in Attack Position.

===Featured Duel #2: Weevil Underwood vs. Yami Yugi - Part 2===

==Yami Yugi's Turn==*Yami Yugi draws.*1 Turn has passed since "2700 [[Parasite CaterpillarLP|Life Points]]'s" activation on Yami's remaining and controls "[[Obnoxious Celtic Guard|Obnoxious Celtic Guardian]]" (2 Turns remaining).*Activates [[Spell Card]] "[[Polymerization]]", sending "[[Curse of Dragon]]" and "[[Gaia the Fierce Knight]]" from his [[Hand]] to the [[Graveyard]] to [[Fusion Summon]] "[[Gaia the Dragon Champion]]" (2600 [[ATK]] 1400/ 2100 [[DEF]]1200) in [[Attack Position]].*Uses "[[Gaia the Dragon Champion]]" to Attack [[Weevil]]'s "[[Leghul]]", but Weevil activates [[Continuous Trap Card]] "[[DNA Surgery]]" and declares Insect for this card's effect. As long as this card is face-up, all Monsters on the Field become the declared type. Because of this and Weevil's "[[Insect Barrier]]", "[[Gaia the Dragon Champion]]" cannot Attack.

==Weevil Underwood's Turn==*Draws [[Spell Card]] "[[Cell Division]]" has 3900 Life Points and subsequently [[Activate]]s it: Weevil selects controls "[[Leghul]]" and [[Special Summon]]s a "[[Cell Division Token]]" with the same stats (300 → 800 [[ATK]] / 350 [[DEF]]) in Attack Position.*Tributes and "[[Pheromone Wasp]]" and "[[Cell Division Token]]" to Summon "[[Insect Queen]]" (2200 → 2700 [[ATK]] 1300/ 2400 [[DEF]]800) in Attack Position. Thanks to its Effect, it gains [[ATK]] equal to 200 × the number of [[Insect]]-[[Type]] Monsters on the Field (4), i.e. an +800 [[ATK]] boost ("[[Insect Queen]]": 2700 → 3500 [[ATK]] / 2400 [[DEF]]).*Uses "[[Leghul]]'s" effect to allow it to attack Yami Yugi Directly ([[Yami Yugi|Yami]]: 2700 → 1900 [[Life Points]]).*Tributes "[[Leghul]]Parasite Caterpillar" ("[[Insect Queen]]": 3500 → 3300 [[ATK]] / 2400 [[DEF]]) equipped to allow "[[Insect Queen]]" to Attack & Destroy Yami's "[[Gaia the Dragon Champion]]" ([[Yami Yugi|Yami]]: 1900 → 1200 [[Life Points]]) ("[[Insect Queen]]Obnoxious Celtic Guardian": 3300 → 3100 [[ATK]] / 2400 [[DEF]]).*Since it just destroyed a monster, Weevil activates his "[[Insect Queen]]'s" second effect: he [[Special Summon]]s an "[[Insect Monster Token]]" The Seal of Orichalcos (100 [[ATK]] / 100 [[DEF]]anime) on his side |The Seal of the field in [[Attack PositionOrichalcos]] ("[[, "Insect Queen]]Barrier": 3100 → 3300 [[ATK]] / 2400 [[DEF]]), and one set card.

==<u>'''Turn 4: Yami Yugi's Turn==''</u><br />*Yami Yugi draws.*2 Turns have 1 Turn has passed since the activation of the effect of "[[Parasite Caterpillar]]'s" Activation on YamiYugi's "[[Obnoxious Celtic GuardGuardian (anime)|Obnoxious Celtic Guardian]]" (1 Turn 2 Turns remaining).Yami Yugi activates "[[Polymerization (anime)|Polymerization]]" to fuse "[[Curse of Dragon (anime)|Curse of Dragon]]" with "[[Gaia The Fierce Knight (anime)|Gaia The Fierce Knight]]" and [[Fusion Summon]] "[[Gaia the Dragon Champion (anime)|Gaia The Dragon Champion]]" (2600/2100) in [[Attack Position]]. "Gaia the Dragon Champion" attacks [[Weevil]]'s "[[Leghul (anime)|Jeghul]]", but Weevil activates his face-down "[[DNA Surgery (anime)|DNA Surgery]]" and declares Insect for its effect. Now as long as this card is face-up, all Monsters on the Field become the declared type. Because of this and Weevil's "[[Insect Barrier (anime)|Insect Barrier]]", "Gaia the Dragon Champion" cannot attack. <u>'''Turn 5: Weevil Underwood'''</u><br />*Normal Summons Weevil draws "[[Cell Division]]" and subsequently [[activate]]s it to target "Leghul" and [[Special Summon]] a "[[KuribohCell Division Token]]" with the same stats as "Leghul" (300 → 800/350) in Attack Position. Weevil then Tributes "[[ATKPheromone Wasp (anime)|Pheromone Wasp]]" and the "Cell Division Token" in order to Tribute Summon "[[Insect Queen (anime)|Insect Queen]] " (2200 → 2700/ 2400) in Attack Position. Due the effect of "Insect Queen", it gains 200 [[DEFATK]]) in for each [[Insect]]-[[Defense PositionType]] Monster on the Field. There are currently four ("Insect Queen": 2700 → 3500/2400). "Leghul" attacks directly via its own effect ([[Yami Yugi]] 2700 → 1900).  Weevil then Tributes "Leghul" ("Insect Queen": 3500 → 3300/2400) in order to allow "Insect Queen" to attack. "Insect Queen" attacks and destroys Yami Yugi's "Gaia the Dragon Champion" ([[Yami Yugi]]1900 → 1200) ("Insect Queen": 3300 → 3500 3100/2400). Since "Insect Queen" destroyed a monster by battle, its last effect activates, allowing Weevil to [[Special Summon]] an "[[ATKInsect Monster Token (anime)|Insect Monster Token]] " (100 → 600/ 2400 100) to his side of the field in [[DEFAttack Position]]("Insect Queen": 3100 → 3300/2400).*<u>'''Turn 6: Yami Yugi'''</u><br />Yami Yugi draws. 2 Turns have passed since the activation of the effect of "Parasite Caterpillar" on Yami Yugi's "Obnoxious Celtic Guardian" (1 Turn remaining). Yami Yugi then Normal Summons "[[Kuriboh (anime)|Kuriboh]]" (300/200) in [[Defense Position]] ("Insect Queen": 3300 → 3500/2400) and Sets a Cardcard.

* [[Giant Rex (anime)|Giant Rex]]* [[Gilasaurus (anime)|Gilasaurus]] x2* [[Kaitoptera (anime)|Kaitoptera]]* ''[[Tyrant Dragon (anime)|Tyrant Dragon]]''

* ''[[Horned Saurus (anime)|Horned Saurus]]''

* [[Polymerization (anime)|Polymerization]] ''(''[[Polymerization (Fusion)|Alternate version]]'' in the dubs)''* [[The Seal of Orichalcos (anime)|The Seal of Orichalcos]]

* [[Red-Eyes B. Dragon (later anime)|Red-Eyes B. Dragon]]

* [[Panther Warrior (anime)|Panther Warrior]]* [[Rocket Warrior (anime)|Rocket Warrior]]

* [[Scapegoat (later anime)|Scapegoat]]

* [[Magical Arm Shield(anime)|Magic Arm Shield]]* [[Metalmorph (anime)|Metalmorph]]

* [[Insect Queen (anime)|Insect Queen]]* [[Leghul (anime)|Leghul]]

* [[Pheromone Wasp (anime)|Phenomenon Wasp]]

* [[Insect Barrier (anime)|Insect Barrier]]* [[The Seal of Orichalcos (anime)|The Seal of Orichalcos]]

* ''[[DNA Surgery (anime)|DNA Surgery]]''

* [[Curse of Dragon (anime)|Curse of Dragon]]* [[Gaia The Fierce Knight (anime)|Gaia The Fierce Knight]]

* [[Kuriboh (anime)|Kuriboh]]* [[Obnoxious Celtic GuardGuardian (anime)|Obnoxious Celtic Guardian]]

* [[Gaia the Dragon Champion (anime)|Gaia The Dragon Champion]]

* [[Polymerization (anime)|Polymerization]] ''(''[[Polymerization (Fusion)|Alternate version]]'' in the dubs)''

* [[Baby Dragon (anime)|Baby Dragon]]* [[Blue-Eyes White Dragon (anime)|Blue-Eyes White Dragon]]* [[Dark Magician (anime)|Dark Magician]]* [[Garoozis (anime)|Garoozis]]* [[Killer Needle (anime)|Killer Needle]]* [[Megazowler (anime)|Megazowler]]* [[Red-Eyes B. Dragon (later anime)|Red-Eyes B. Dragon]]

* [[The Dark Ruler (anime)|The Dark Ruler Ha Des]]* [[Larvae Moth (anime)|Larvae Moth]]* [[Leghul (anime)|Leghul]] (Dub)* [[Neko Mane King (anime)|Neko Mane King]] (Dub)

* [[Twin-Headed Thunder Dragon (anime)|Twin-Headed Thunder Dragon]]

* [[Dragon Nails (anime)|Dragon Nails]]* [[Time Wizard (anime)|Time Wizard]]<ref group=Notes name=timewiz>This card was played as a Spell Card. It is an [[Effect Monster]] in the ''TCG''/''OCG''.</ref>

* [[Bottomless Trap Hole (anime)|Bottomless Trap Hole]]* [[Kunai with Chain (anime)|Kunai with Chain]]