Douglas Birley

Doctor Demonicus, real name Douglas Birley, is a recurring character in the Marvel universe, who first appeared as a foe of Godzilla.

History
Douglas Birley was a geneticist fascinated by mutation, which he did studies on. After being contaminated by a radiation spill, he went mad when he realized he did not gain superpowers, but instead got skin cancer. Without a job, Birley saw a report of a meteorite crashing in the Aleutian Islands, which he took over with his army of Demon-Soldiers (former mercenaries and criminals) and enslaved the native Inuits who lived there, and planned to use the meteorite- now called the Life Stone- against the world he feels had betrayed him.

Inspired by the giant monster Godzilla, Birley, now Doctor Demonicus, began to subject the tissues of various creatures to the radiation of the Life Stone. He then extracted the hormones from the mutated tissues, then injected them back into the creatures, and exposed them to the meteorite. The creatures mutated, the first of which became Batragon, and then the trio of Centipor, Ghilaron and Lepirax.

He sent Batragon to attack a Liberian oil tanker so his Demon-Soldiers can get the oil for him. After Godzilla fought and wounded Batragon, the creature retreated back to Demonicus' base for the Life Stone. Demonicus ordered the Inuits to continue their work or he'll use his monsters against them. Batragon was eventually killed and Demonicus prepared to use the rest of his creations against Godzilla.