While still in her teens, amateur occultist Jennifer Kale used the Tome of Zhered-Na and conducted a ritual in the Florida Everglades that opened a dimensional portal enabling Thog to enter the Earth-realm. First taking the form of a small winged creature, he quickly grew in size and began hunting for the being that summoned him. It tracked Jennifer and her younger brother Andy to the Roxie Theater in nearby Citrusville and began attacking them. Strangely enough, the Man-Thing witnessed Thog's emergence on this world and instinctively followed him to the theater. The two engaged in combat and Thog took on a more humanoid appearance. Irritated that the Man-Thing interrupted his quest, he unleashed a blast of eldritch energy against him, but this had little impact against the muck monster. Thog followed the Man-Thing back to the swamps at which time, Jennifer Kale tried to reverse the spell that summoned him by destroying the Tome. The pages caught fire and a dimensional aperture opened before them. The Man-Thing (through no conscious act of his own) pushed Thog through the portal, sending him back into the Abyss.
When the balance between the realities began to break and all the realities began to merge he disguised himself as a human and called himself the Overmaster in an attempt to break into the world of the gods known as Therea. He amassed an army from the Congress of Realties, a group of beings who formed together from all different worlds in an attempt to ascend to godhood. Dakimh the Enchanter gathered Jennifer along with Man-Thing, Howard the Duck and Korrek who had each been plucked from their own worlds in an attempt to stop him. Thog was defeated by Man-Thing who used the pure water of Therea to petrify the demon.
Thog became trapped on the world Therea, unable to move because of the bright sunlight. However, when Dakimh was slain in battle, the sun blinked out and he managed to escape through a portal. He then hatched an elaborate scheme involving siblings Danielle Nicolle and her brother, the Scavenger, harvesting emotions to construct a pyramid that would imprison the Man-Thing. His plan backfired when Man-Thing's and Steve Gerber's energies combined and destroyed the pyramid. He was then incinerated by the Man-Thing.
Thog is a demon with the following powers:
- Metamorphosis: Thog can physically alter his shape and size, taking on the appearance of an inhuman winged monstrosity. He can also assume a humanoid appearance, albeit with demonic characteristics (pointed ears, sharpened canines, tail, etc.)
- Eldritch Blast: Thog can project blasts of Hellfire from his hands.
- Winged Flight: Thog can fly by way of a pair of bat-like wings. He only possesses these wings in his natural form.
- While Thog and Thog the Ancient (an Hyborian Age creature being created by Robert E. Howard) aren't the same (The Appendix to the Handbook of the Marvel Universe consider them distinct beings) (apart from their name and status of elder demons), both are stated to be possibly related to Thaug, an Hyborian Age demon (as well created by Howard). Thog, and "the monstrous Thaug and Thog who existed circa 10,000 BC" were later stated to possibly share a familial relation.
- Thog the Netherspawn is a Class Two demon.
- 13 appearance(s) of Thog (Earth-616)
- 6 appearance(s) in handbook(s) of Thog (Earth-616)
- 2 mention(s) of Thog (Earth-616)
- 6 mention(s) in handbook(s) of Thog (Earth-616)
- 2 invocation(s) of Thog (Earth-616)
- 5 image(s) of Thog (Earth-616)
- 1 quotation(s) by or about Thog (Earth-616)