Moltar is a scientist/geologist that has the technology to genetically engineer molten creatures. He first appeared in comic books in Space Ghost #1 The Sinister Spectre, however he appeared in the original Space Ghost TV show long before that in the episode "The Ovens of Moltar".
Backstory: Though not much is known about Moltar's origins, it is likely, that at one point, something horrific happened to his face. This is probably the case due to the fact that he wears a helmet at all times. If this, indeed is the case than his disfiguration was most likely caused by the molten Lava that surrounds him constantly. His disfiguration might also have been what turned him bad. The pain from the burns might have been so great that it caused him to go insane or at least disgruntled enough to become a villain. On top of all that, his disfiguration might have alienated him from others.