On December 31st, 1899, Koth was summoned by a cult of mystics in the American Midwest who were attempting to summon Satan by sacrificing two infant orphans. Their calls were answered by Koth instead, who devoured the cultists' souls, but the infants were rescued by Zator, servant of the Seven, a cadre of mystics dedicated to the Lords of Order. The children, who later took the names Doctor Occult and Rose Psychic, were raised to combat Koth. Years later, Occult finally vanquished Koth in a battle on the Astral Plane.
In 1945, a group of Nazi sympathizers tried to summon Koth to destroy America by offering Doctor Occult as a sacrifice, but they instead summoned Stalker the Soulless, who was defeated by the Justice Society of America.
Decades later, Doctor Occult and Rose Psychic had merged into a single being and shared the same body.  Koth returned as an agent of Chaos seeking to destroy them by seducing Rose and entrapping her on the Astral Plane, but through the strength of their bond Rose and Occult overcame Koth again and reunited.
- Astral Projection: Koth can enter the Astral Plane at will.
- Command of Infinite Evil Forces: Koth can unleash the supernatural monsters of the occult realm.
- Metamorphosis: Koth has assumed several different forms, including that of a huge red-skinned demonic humanoid, and a handsome blond man.
- Soul Consumption: Koth can consume only the souls of sinners. 
- Armor (unknown if it is enchanted)
- Koth has been observed riding a horse, but seems able to transport himself with his own magic.
- Sword (unknown if it is enchanted)
- Although this character was originally introduced during DC's Earth-Two era of publication, their existence following the events of the 1985–86 limited series Crisis on Infinite Earths remains intact. However, some elements of the character's Pre-Crisis history may have been altered or removed for Post-Crisis New Earth continuity, and no longer apply.
- Koth actually first appeared in The Comics Magazine #1, published by Centaur Publications, some months before his appearance in More Fun Comics. The feature in which he appeared, "Dr. Mystic: The Occult Detective", was essentially Doctor Occult under a different name, by the same creators, and in fact the plot of Doctor Occult's feature in More Fun Comics #14 picks up directly where "Doctor Mystic" leaves off.
- Koth claims that Satan does not exist (which is inconsistent with many other DC stories), and refers to the "Abysmal Eternity" as what his cultists could think of as Hell. As a demon, Koth should not be considered a reliable source of information regarding the supernatural order of the multiverse.
- 7 Appearances of Koth (New Earth)
- 1 Images featuring Koth (New Earth)
- Quotations by or about Koth (New Earth)
- Character Gallery: Koth (New Earth)