X-Naut PhDs are enemies which appear in Paper Mario: The Thousand-Year Door.

History[]

They are X-Naut doctors that develop many of the X-Naut's arsenal of weaponry and advanced technology. Led by Sir Grodus, they are a part of the X-Naut alliance and are found in the X-Naut Fortress.

In battle, X-Naut PhDs can use various chemicals. They can attack either Mario and his partners or even use their chemicals on themselves or allies. Their attack is broken into five different attacks of different colors.

Battle Statistics[]

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Characters	Protagonists	Mario • Princess Peach • Luigi • TEC-XX
	Antagonists	Bowser • Kammy Koopa • Sir Grodus • Lord Crump • Secret Society of X-Nauts • The Three Shadows (Beldam, Marilyn, Vivian, Doopliss) • Shadow Queen
	Partners	Goombella • Koops • Madame Flurrie • Yoshi • Vivian • Admiral Bobbery • Ms. Mowz
	Other	Arfur • Audience • Bandy Andy • Battle Master • Billy • Black Chest Demon • Blooey • Bob • Bob-omb Squad • Bobolink • Bomberto • Bootler • Bub • Bub-ulber • Businessman • Charlieton • Chef Shimi • Chestnut King • Chet Rippo • Chomp Country • Cleftor • Cranberry • Craw-Daddy • Creepy Steeple Boo • Darkly • Dazzle • Dead Bones • Destructors • Doe T. • Don Pianta • Dupree • Eddy the Mask • Eve • Excess Express Conductor • Excess Express Engineer • Fahr Outpost Mayor • Flavio • Francesca • Frankie • Fred • Fuzz • Garf • General White • Ghost T. • Gloomer • Gob • Goldbob • Goom Goom • Goomba Bros. • Goomez • Goomfrey • Goomther • Goose • Grifty • Grubba • Hamma, Bamma, & Flare • Hamma Jamma's father • Hamma Jamma's grandfather • Hand-It-Overs • Hayzee • Heff T. • Herb T. • Hizza • Ishnail • Jabble • Jerry • Johnson • Jolene • Jr. Troopa • Kolorado's father • Koopie Koo • Koopley • Koopook • KP Koopas • KP Pete • Kroop • Lady Bow • Lahla • Laki • Larson • Lucky • Luigi • Lumpy • Magikoopa Masters • Maitre Delish • Master Crash • Mayor Dour • McGoomba • Merlee • Merlon • Merluvlee • Maude and Flo • Mind-Bogglers • Minister Crepe • Mousimilian • Mr. Hoggle • Niff T. • Nob • Old Man Skoo • Pa-Patch • Parakarry • Parrot • Peeka • Pennington • Petuni • Pianta Syndicate • Pierre • Pine T. • Pine T. Jr. • Plenn T. • Podler • Podley • Poker Faces • Pokey Triplets • Porter • Prince Mush • Princess Eclair • Professor Frankly • Pungent • Pungry • Punio • Puniper • Puni Elder • Punk Rocks • Rob • Robbo Gang • Rocko • Ronnie • Scarlette • Screamy • Shellshock • Shellshockers • Sir Swoop • Spike Storm • Spiky Joe • Stewart • Swindell • Swob • Sylvia • TEC-XX • The Koopinator • The Traveling Sisters Three • Thriff T. • Tiny Spinies • Toadette • Toadia • Toadsworth • Toad waitress • Toce T. • Tony • Toodles • Torque • Vinny • Wings of Night • Wonky • Zess T. • Zip Toad
Locations	Areas	Boggly Woods • Broadshroom • Circuit Break Island • Creepy Steeple • Deepdown Depot • Excess Express • Fahr Outpost • Flurrie's House • Fresh Juice Shop • Glitz Pit • Glitzville • Great Tree • Grimble Forest • Hatesong Tower • Herb T.'s Place • Hooktail Castle • Hot Dog Stand • Inn • Item Shop • Jazzafrazz Town • Keelhaul Key • Keelhaul Galleria • Lovely Howz of Badges • Mario's House • The Moon • Netherworld • Niff T.'s Shop • Northwinds Mart • Palace of Shadow • Petalburg • Petal Meadows • Pianta Parlor • Pirate's Grotto • Pit of 100 Trials • Podley's Place • Plumpbelly Village • Poshley Heights • Poshley Sanctum • Pudding Continent • Pungent's Shop • Rapturous Ruins • Riddle Tower • Riverside Station • Rogueport • Rogueport Sewers • Rumblebump Volcano • Sales Stall • Shhwonk Fortress • Souvenir Shop • Strudel Continent • Toad Bros. Bazaar • Trouble Center • Twilight Shop • Twilight Town • Twilight Trail • Waffle Kingdom • Westside Goods • X-Naut Fortress
	Transportations	Excess Express • Black Skull
	Bowser levels	World 1 • World 2 • World 3
Bosses	Main/recurring	Lord Crump • Bowser • Kammy Koopa • Sir Grodus • Shadow Sirens • Gloomtail • Bonetail
	Chapter	Hooktail • Magnus von Grapple • Macho Grubba • Doopliss • Cortez • Smorg • Magnus von Grapple 2.0 • Shadow Queen
	Mini-bosses	Blooper • Gold Fuzzy • Red Bones • Iron Cleft • Rawk Hawk • Gus • Atomic Boo • Dark Bones
Enemies	Enemies	Amazy Dayzee • Arantula • Badge Bandit • Bandit • Bald Cleft • Big Bandit • Bill Blaster • Bob-omb • Bob-ulk • Bombshell Bill • Bombshell Bill Blaster • Boo • Boomerang Bro • Bristle • Bulky Bob-omb • Bullet Bill • Buzzy Beetle • Chain Chomp • Cleft • Crazee Dayzee • Dark Boo • Dark Bristle • Dark Craw • Dark Koopa • Dark Koopatrol • Dark Lakitu • Dark Paratroopa • Dark Puff • Dark Wizzerd • Dry Bones • Dull Bones • Elite Wizzerd • Elite X-Naut • Ember • Fire Bar • Fire Bro • Flower Fuzzy • Frost Piranha • Fuzzy • Fuzzy Horde • Gloomba • Goomba • Green Fuzzy • Green Magikoopa • Grodus X • Hammer Bro • Hyper Bald Cleft • Hyper Cleft • Hyper Goomba • Hyper Paragoomba • Hyper Spiky Goomba • Ice Puff • Iron Cleft • Koopa Troopa • Koopatrol • KP Koopa • KP Paratroopa • Lakitu • Lava Bubble • Magikoopa • Mini-X-Yux • Mini-Yux • Mini-Z-Yux • Moon Cleft • Pale Piranha • Parabuzzy • Paragloomba • Paragoomba • Paratroopa • Phantom Ember • Pider • Piranha Plant • Poison Pokey • Poison Puff • Pokey • Putrid Piranha • Red Chomp • Red Magikoopa • Red Spike Top • Ruff Puff • Shady Koopa • Shady Paratroopa • Sky-Blue Spiny • Spania • Spike Top • Spiky Gloomba • Spiky Goomba • Spiky Parabuzzy • Spinia • Spiny • Spunia • Swampire • Swooper • Swoopula • Whacka • White Magikoopa • Wizzerd • X-Fist • X-Naut • X-Naut PhD • X-Punch • X-Yux • Yux • Z-Yux
Items	Battle	Boo's Sheet • Coconut Bomb • Courage Shell • Courage Meal • Dizzy Dial • Earth Quake • Egg Bomb • Fire Flower • Fright Mask • Hot Sauce • HP Drain • Ice Storm • Love Pudding • Mini Mr. Mini • Mr. Softener • Mystery • Peach Tart • Point Swap • POW Block • Power Punch • Repel Cape • Ruin Powder • Shooting Star • Sleepy Sheep • Spite Pouch • Stopwatch • Thunder Rage • Thunder Bolt • Volt Shroom • Zess Dynamite
	Recovery	Cake Mix • Choco Cake • Coco Candy • Coconut • Couple's Cake • Dried Bouquet • Dried Shroom • Electro Pop • Fire Pop • Fresh Juice • Fresh Pasta • Fried Egg • Fruit Parfait • Golden Leaf • Gradual Syrup • Healthy Salad • Heartful Cake • Honey Candy • Honey Shroom • Honey Super • Honey Syrup • Honey Ultra • Horsetail • Hot Dog • Icicle Pop • Ink Pasta • Inky Sauce • Jammin' Jelly • Jelly Candy • Jelly Shroom • Jelly Super • Jelly Ultra • Keel Mango • Koopa Bun • Koopa Tea • Koopasta • Life Shroom • Mango Delight • Maple Shroom • Maple Super • Maple Syrup • Maple Ultra • Meteor Meal • Mistake • Mousse Cake • Mushroom • Mystic Egg • Omelette Meal • Peachy Peach • Poison Shroom • Shroom Broth • Shroom Cake • Shroom Crepe • Shroom Fry • Shroom Roast • Shroom Steak • Slow Shroom • Snow Bunny • Space Food • Spaghetti • Spicy Pasta • Spicy Soup • Super Shroom • Tasty Tonic • Trial Stew • Turtley Leaf • Ultra Shroom • Whacka Bump • Zess Cookie • Zess Deluxe • Zess Dinner • Zess Frappe • Zess Special • Zess Tea
	Key	Autograph • Battle Trunks • Black Key • Blanket • Blimp Ticket • Blue Key • Blue Potion • Box • Briefcase • Card Key • Castle Key • Champ's Belt • Chuckola Cola • Cog • Contact Lens • Cookbook • Data Disk • Dubious Paper • Elevator Key • Galley Pot • Gate Handle • Gold Card • Gold Ring • Goldbob Guide • Green Potion • Grotto Key • House Key • Lottery Pick • Magical Map • Mailbox SP • Moon Stone • Necklace • Old Letter • Orange Potion • Package • Palace Key • Platinum Card • Present • Puni Orb • Ragged Diary • Red Key • Red Potion • Routing Slip • Shell Earrings • Shine Sprite • Shop Key • Silver Card • Skull Gem • Special Card • Star Key • Station Key • Steeple Key • Storage Key • Strange Sack • Sun Stone • Superbombomb • Super Luigi series • The letter "p" • Train Ticket • Ultra Stone • Up Arrow • Vital Paper • Wedding Ring • Wrestling Mag
	Badges	All or Nothing • Attack FX B • Attack FX G • Attack FX P • Attack FX R • Attack FX Y • Bump Attack • Charge • Charge P • Chill Out • Close Call • Close Call P • Damage Dodge • Damage Dodge P • Defend Plus • Defend Plus P • Double Dip • Double Dip P • Double Pain • Feeling Fine • Feeling Fine P • Fire Drive • First Attack • Flower Finder • Flower Saver • Flower Saver P • FP Drain • FP Plus • Hammer Throw • Hammerman • Happy Flower • Happy Heart • Happy Heart P • Head Rattle • Heart Finder • HP Drain • HP Drain P • HP Plus • HP Plus P • Ice Power • Ice Smash • Item Hog • Jumpman • L Emblem • Last Stand • Last Stand P • Lucky Day • Lucky Start • Mega Rush • Mega Rush P • Money Money • Multibounce • Nostalgic Tunes • P-Down, D-Up • P-Down, D-Up P • P-Up, D-Down • P-Up, D-Down P • Peekaboo • Piercing Blow • Pity Flower • Power Bounce • Power Jump • Power Plus • Power Plus P • Power Rush • Power Rush P • Power Smash • Pretty Lucky • Pretty Lucky P • Quake Hammer • Quick Change • Refund • Return Postage • Shrink Stomp • Simplifier • Sleepy Stomp • Slow Go • Soft Stomp • Spike Shield • Super Appeal • Super Appeal P • Timing Tutor • Tornado Jump • Unsimplifier • W Emblem • Zap Tap
	Other	Crystal Stars • Dramalama Plaque • Fat Dog • Gold Bar • Gold Bar x3 • Inn Coupon • Magical Map • Marvelous Compass • Mushroom Full Course • Nitro Honey Syrup • Southern Fried Egg Dog of Tastiness • Star Piece • The Big Green 01
Techniques	Moves	Action command • Appeal • Art Attack • Boat Mario • Bob-ombast • Body Slam • Bomb • Bomb Squad • Charge • Clock Out • Dodgy Fog • Earth Tremor • Fiery Jinx • First Strike • Flee • Gale Force • Ground Pound • Guard • Gulp • Headbonk • Hold Fast • Infatuate • Jump • Kiss Thief • Lip Lock • Love Slap • Mini-Egg • Multibonk • Plane Mario • Power Lift • Power Shell • Rally Wink • Shade Fist • Shell Shield • Shell Slam • Shell Toss • Showstopper • Smooch • Spin Hammer • Spring Jump • Stampede • Stylish Move • Superguard • Supernova • Sweet Feast • Sweet Treat • Tattle • Tease • Veil
Miscellaneous	Statuses/ailments	Allergic • Badge Point • Burn • Charged • Confused • Danger • Defense • DEF-Up • Dizzy • Dodgy • Electrified • Fast • Flower Point • Frozen • Heart Point • Huge • Immobilized • Invisible • No Skills • Payback • Peril • Poison • Power • POW-Down • POW-Up • Regeneration • Sleep • Slow • Soft • Star Point • Star Power • Tiny
	Objects	! Switch • Badge • Black chest • Black Skull • Blue Pipe • Blue Switch • Brick Block • Candy Cane • Cheep Blimp • Chomp Rock • Coin Block • Coral • Crystal Ball • Elevator • Giant Cannon • Goal Pole • Heart • Hidden Block • Koopa Clown Car • Meat • Metal Block • Pianta Token • Power-draining machine • Recovery Block • S.S. Flavion • Save Block • Shine Block • Star Piece • Stone Block • Stone Keys • Teleporter • The Thousand-Year Door • Treasure chest • X-Ship • Yellow Block
Items in bold appear only in the Nintendo Switch remake.