Underchomp

The Underchomp is a red, yellow, and blue three-headed Chain Chomp, that acts as a guard dog of The Underwhere in Super Paper Mario. It is located in Underwhere Road. Beating the Underchomp is Dorguy the Third's test. The Underchomp is based upon the legendary hellhound Cerberus, a giant, three-headed dog who guarded the gates of Hades in Greek mythology. In one story, he was put to sleep by the music of Orpheus, which inspired Piccolo's music putting the Underchomp to sleep.

Mario, Luigi and Bowser face against this beast in a far different way from other enemies in the game; they fight the creature in a turn-based battle, though not in the same fashion as other Paper Mario games.

Each head has a special ability. The Red Underchomp can breathe crimson fire, the Blue Underchomp can breathe blue fire, and the Yellow Underchomp has stinky breath. Each Underchomp can also charge up for one turn and attack stronger later.

Using Bowser and Thudley to attack the Underchomp is the most effective way to defeat the massive enemy. If the player has already added the Pixl Piccolo to their roster, then using her power makes the Underchomp fall asleep for several turns. Boomer is a great choice for damaging and defeating the Underchomp. Putting the Underchomp to sleep and using Luigi to attack it can also defeat the Underchomp, with each head taking two Super Jumps to defeat. The Underchomp wakes up after the Spring Jumps have been performed but does not attack, allowing Piccolo to be used to attack the next head. They are possible to defeat in one turn by using a Shooting Star. Also effective is using Fleep to make the Underchomp dizzy.

Battle
Instead of battling the Underchomp in the style of the game's previous bosses, the Underchomp battle is a parody of general, turn-based RPGs, specifically the Japan-exclusive Famicom game Mother, which has a battle system that looks and functions similarly to the Underchomp battle.

Player

 * Attack: "[The player] attacks! You deal [] damage to [the] Underchomp! / But your attack is dodged!"
 * Technique
 * Flip*: "Mario flips! ...But nothing happens."
 * Flame**: "Bowser breathes fire! ...But the flames have no effect on [the] Underchomp!"
 * Super jump***: "Luigi glares at [the] Underchomp and launches a super jump! You stomp [the] Underchomp for [] damage!"
 * Pixl
 * Thoreau: "[The player] throws Thoreau at the Underchomp! Urg... [The] Underchomp is too heavy to lift!"
 * Boomer: "Take that, enemy! [The player] throws Boomer! Boomer explodes! [The] Underchomp takes damage! / Miss! The attack is a failure!"
 * Slim: "[The player] uses Slim! [The player] turns sideways and is hard to see!"
 * Thudley: "[The player] uses Thudley! A heavy-duty attack! The attack is a success! [The] Underchomp takes [] damage!"
 * Carrie: "[The player] hops onto Carrie! You feel a little taller! ...But that is the only effect, unfortunately."
 * Fleep: "[The player] uses Fleep on [the] Underchomp! [The] Underchomp looks dizzy!"
 * Cudge: "[The player] uses Cudge to attack [the] Underchomp! Direct hit! [The] Underchomp takes [] damage!"
 * Dottie: "[The player] uses Dottie! [The player] gets tiny! Where did he go?!"
 * Barry: "Spinning destruction! Barry slams powerfully into [the] Underchomp! Nice hit! [The] Underchomp takes [] damage!"
 * Dashell: "[The player] uses Dashell! [The player] dashes quickly! ...But nothing else happens."
 * Piccolo: "[The player] uses Piccolo! Piccolo plays a mysterious song! [The] Underchomp falls into a deep sleep!"
 * Item
 * Switch
 * Mario** *** ''"Tippi says, ' Go, Mario! ' [The player] switches places with Mario!
 * Bowser* *** ''"Bowser says, ' Stomping time! ' [The player] switches places with Bowser!"
 * Luigi* ** ''"Luigi says, ' I'm on the job! ' [The player] switches places with Luigi!"
 * Escape: "[The player] runs away! ...But he got noticed! / ...A successful escape!"

(* = when playing as Mario; ** = when playing as Bowser; *** = when playing as Luigi)
 * Defeat
 * Mario*: "Tippi says, ' Mario! Noooo! ' Mario falls in battle..."
 * Bowser**: "Bowser says, ' Not again! ' Bowser falls in battle..."
 * Luigi***: "Luigi says, ' Bro! Forgive me... ' Luigi falls in battle..."

Underchomp

 * Attacks:
 * "[The] Underchomp attacks! [The player] takes [] damage! / [The player] dodges like a pro!"
 * "Red Underchomp breathes crimson fire! Youch! [The player] takes [] damage!"
 * "Blue Underchomp breathes blue fire! Now that's hot! [The player] takes [] damage! / [The player dodges with style!"
 * "Yellow Underchomp expels stinky breath! Oh no! It's putrid! [The player] takes [] damage! / [The player] dodges the stink!"
 * "[The] Underchomp gathers strength!"
 * Slim/Dottie: "[The] Underchomp is looking for [the player]..."
 * Asleep: "[The] Underchomp is taking a nice nap..."


 * Defeat:
 * "You defeated [the] Underchomp!"
 * "You defeated the Underchomp! [The player] receives 6000 points!"
 * "You gained a level! Your HP increased by 5 / Your attack power increased by 1!"

Trivia

 * The battle music for Underchomp is an 8-bit remix of the mini-boss theme.
 * When the player attacks using Barry, the Underchomp is often dealt 0 damage. However, the screen will say: "Nice hit! The Underchomp takes 0 damage!"
 * When the player dies, each character will say something else. When Mario dies, Tippi will say: "", Bowser will say: "Not again!" and Luigi will say: ""

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