Terramite

The Terramite was one of Dr. Animo's Mega-Mutants which appeared in the Ben 10 episode Omni-Tricked, Part 1.

Description
An enormous mutant hybrid of termite and elephant, the Terramite had six legs, a thickly-armoured shell, sharp mandibles, and a flexible trunk. It possessed a high degree of superhuman strength and durability, could burrow through the ground at great speed, and was immune to the high temperature of a volcanic eruption.

History
Created by Dr. Animo to cause Mount Megalodon to erupt so that he might hold the city of Portland to ransom, the Terramite was encountered by Ben Tennyson in his Cannonbolt form. Proving no match for the colossal beast, Cannonbolt was quickly beaten, and the Terramite moved off to carry out his master's orders.

Discovering the creature's true mission, Ben moved to thwart Animo, but before he could transform into Overflow to douse the lava, he noticed that the Omnitrix had somehow acquired a new alien DNA sample: Gax.

Eager to try out this new addition to his arsenal, Ben changed to Gax and attacked the Terramite. However, the sheer power of this alien caused the very mountain itself to shatter, and Ben was forced to use the Terramite's body to plug the gushing lava before permanently sealing it with a huge boulder.

The Terramite was ultimately buried, unconscious, in a rockslide.