Frankenstein's Monster is an artificial construct created by the late Dr. Victor Frankenstein.
The creature was created from cobbled corpse pieces by a young medical student by the name of Victor Frankenstein in 1792, Ingolstadt, Germany. Through some sort of miracle a strange bolt of lightning animated the construct, giving it life and intelligence. It was later revealed to be animated by Vril.
Upon receiving life, Frankenstein's Monster was rejected by his creator, forcing the creature to flee. The outside world was not forgiving as all fear his monstrous figure. He haunted his father, promising to leave the world of man forever, until he created him a mate so he may not be alone. His creator refused and out of anger the Monster killed Victor's beloved by accident.
The story of the creature led to the inspiration of Mary Shelley's Gothic novel Frankenstein; or, The Modern Prometheus, published in 1818. Since leaving behind its master the creature has survived well into the 20th Century.
After being chased from his place of origin, he was captured in France in 1863 by soldiers, and later imprisoned in Austria in 1911, becoming a circus freak for the amusement of the masses. The creature was later exchanged and transported to Mexico in 1955 to be used fighting in Mexican boxing.
In 1956 he crossed fists with B.P.R.D. agent, Hellboy. In the confusion the creature slipped away whist his masters contended with the American agent. He and Hellboy later met in a bar and drank tequila together.
The monster sought refuge in an abandoned temple where for the first time met a kindly old psychic woman who took pity on the creature.