- Bio Kard: "A demon, or Oni, Moloch is a creature known more for his strength than his intellect. Astoundingly powerful and remarkably cruel, this hulking brute takes pure delight in the pain and suffering of others, especially if he has caused that pain."
Moloch is the only known ally of his Oni counterpart, Drahmin. Unlike Drahmin however, distorted and consumed by rage as he may be, Moloch has most likely always been a demon from the Netherrealm. The sorcerer Quan Chi confronted Moloch and Drahmin with an offer to free them from the Netherrealm if they protected him from the ninja spectre Scorpion. It was no surprise to Moloch that Drahmin accepted the offer and so they attacked Scorpion whenever he came near Quan Chi. As the two Oni were combating Scorpion, Quan Chi escaped from the dark realm without them. Enraged, Moloch and Drahmin followed Quan Chi through the portal but were transported to a different location than the sorcerer.
The Oni encountered the cyborg Cyrax in Outworld but were forced to flee from his bombs. Eventually, they took refuge in a forest and feasted on those who wandered too close to its borders. Li Mei came too close to the forest, but escaped through the trees. After that, they were enlisted by another sorcerer, Shang Tsung. They were held in the basement of his palace, as an insurance policy, should Quan Chi turn on him. Eventually, Moloch and Drahmin were set free. Instead of confronting Quan Chi, they ironically protected him by raiding Scorpion and hurling him into the Soulnado. Both Onis then disappeared from Shang Tsung's palace, as it was later destroyed by an explosion.
- Armageddon: "The Oni Destroyer Moloch absorbed the gift of godlike power from Blaze and was transformed into a Destroyer of Worlds. In a gesture symbolic of his new power, he slammed his fist against the pyramid, completely shattering the structure. Moloch then laid waste to Edenia, transforming it into a barren wasteland not unlike the Netherrealm. Because he destroyed the Edenian portals, however, Moloch was trapped there, a victim of his own destructive rage."