Personal Info:
Real Name: Grundroth
Also Known As: No known Alias
Place Of Birth: Jotunheim, Asgard dimension
First Appearance: Thor Vol.1 #375 (1987) Modern Age Villain
Known Associates: Loki
Group Affiliation: Frost Giants of Jotunheim
Base Of Operations: Jotunheim, Asgard dimension
Grudges: Thor
Creators: Walter Simonson and Sal Buscema
Enhanced Abilities: Grundroth has vast super human strength, endurance and durability. His flesh and bone are far denser than similar human tissue, contributing to his superhuman strength and weight, which are also the result of his great size.
Invulnerability: Grundroth is resistant to conventional injury.
Longevity: Grundroth is extremely long-lived (although not immortal).
Grundroth is a member of the Giants of Jotunheim. The Giants of Jotunheim, also known as the Etins, are enormous superhuman beings, most of whom dwell in the other dimensional realm of Jotunheim, one of the Nine Worlds of Asgardian cosmology. They are the traditional enemies of the gods of Asgard, with whom they have gone to war numerous times over the millennia. Jotunheim is a flat ring-shaped realm with high mountains along its inner edge. It is apparently on its own separate dimensional plane, distinct from Asgard's or Earth's. However, there are inter-dimensional portals between the mountains of Jotunheim and those of Asgard, permitting easy passage from one realm to the other.
Grundroth at Marvel Database
Grundroth at Comic Vine