Underchomp

The Underchomp appeared in 2007 video game called Super Paper Mario. 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. Despite the fact that Dorguy the Third is the one that summons it, the Underchomp's Catch Card states that all three Dorguys have ownership of the beast. 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 is similar to how Piccolo's music can put the Underchomp to sleep.

Mario, Luigi and Bowser face the enemy in a far different way from other enemies in the game; they fight the creature in a turn-based battle, though it is farther from the style of other Paper Mario games, and closer to that of the EarthBound and Pokémon series. Its battle music is an 8-bit remix of the normal mini-boss theme.

The player cannot use Tippi at any point during the battle with the Underchomp, and it does not appear in the field before or after the encounter, making it the only enemy in the game (and one of the few in the Paper Mario series) that cannot be Tattled. However, a Tattle exists in the game data.

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