(グロットモン Grottomon)

Type: Ogre Digimon
Family(s): Nature Spirits
Voice actor(s): Derek Stephen Prince (English), Tomohiro Nishimura (Japanese)

Grumblemon is a fictional character from the Digimon Frontier series. He was voiced by Tomohiro Nishimura (Japan) and Derek Stephen Prince (US). In the English version he can't form sentences properly, while in the Japanese version he is portrayed as a street-smart thug, speaking in an old downtown Tokyo accent.


Human Spirit of Earth

Grumblemon is the Legendary Warrior of Earth, using the power of AncientVolcamon. His Beast Hybrid form is Gigasmon.

Grumblemon is a proud figure who hates to be bossed around. He has an overconfident personality and insults his enemies at any chance he gets. First appeared on "A Molehill out of a Mountain", he was the first of the Evil Warriors to surface, Slide Evolving to Gigasmon. He managed to take Tommy and Zoe's spirits. However, when Takuya first became BurningGreymon, Grumblemon lost his Beast Spirit to Takuya and Tommy regained his spirit.

In the episode "No Whamon", he was eventually defeated by J.P. as MetalKabuterimon, who scanned his spirit as Zoe regained hers. Later, both of Grumblemon's spirits were transferred into Takuya's D-Tector, so that Takuya could Hyper Spirit Evolve to EmperorGreymon.

A purified Grumblemon later appeared at The Village Of Beginnings to help the other legendary warriors fight Crusadermon and Dynasmon. His spirit also appeared with the other Legendary Warriors and later like them had a chance to slash Lucemon Larva with a sword, finally destroying him.


Grumblemon wears his handmade "Rot Armor" on his person and wields the "Grotto Hammer". He can also dig through solid rock and open a bottle that releases smoke that can summon Golemon to his command.


  • Seismic Sledge (Snake Eye Break): Pulls a hammer out of the ground or his armor which he uses to crush his enemies as well as to make the earth crack. The hammer can extend on command. (This is how the attack is used in the anime. Other sources say that he turns his enemies into stone and uses his hammer to destroy them.)
  • Jack in the Box: Leaps out of the ground and attacks with his hammer.


As Gigasmon, he is a giant whose skin possesses a firmness that is above ceramics.


Beast Spirit of Earth


  • Quagmire Twister (Hurricane Bomber): Spins around like a tornado.
  • Tectonic Slam (Earthquake): Leaps above the ground and makes a ground-shaking landing.

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