He has red, rock-like skin.

A strange rock formation is growing underground, threatening the world of the Lava Men so their king orders to lift it above the ground. Claiming the surface people are not evil, Molto objects to avoid conflict with them. The Lava Men get a visit from the Thunder God and the Lava King explains that trying to make the Living Rock explode would destroy both their races. The Lava Men engage in battle with the Avengers and the conflict ends when the Hulk, who is still enemies with the team, is tricked into smashing the rock at its only vulnerable spot causing it to implode. The Lava Men engage in battle with the Avengers and the conflict ends when the Hulk is tricked into smashing the rock at its only vulnerable spot, causing it to implode. Thor then convinces the Lava Men to go peacefully back to their own lives.