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. [1]
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.