History
Basallo was the King of the Lava Men. Once, he sent their supreme warrior, Molto, to the surface world to see if they were a threat to the subterranean Lava Men, where he was manipulated by Loki to clash with Thor.[1]
A short time later, an explosion from deep within the Earth rocked the realm of the Lava Men, as the Living Rock forced into it. The Lava Men learned that the Living Rock would generate explosive force when struck, and that it would continue to grow in size until it exploded. Jinku, the witch doctor of the Lava Men, counseled the King to build a machine and drive the Living Rock to the surface world where it would destroy the surface of the planet instead. Despite Molto's protests, the King agreed and followed Jinku's recommendations. This brought them into a conflict with the Avengers, which ended when the Avengers duped the Hulk into striking the Living Rock in the one spot that would destroy it. With the threat over, the Avengers convinced the Lava Men to not invade the surface, and the Lava Men returned to Subterranea.[2]
Some time later, Basallo was convinced by Jinku to steal the Mole Man's volcano-activating machine from the Moloids, as well as stealing Mjolnir from Thor.[3]