At some point, Mr. Hammer lent money to Steve Rifkin but was never paid back. He eventually caught up to Rifkin. Rifkin offered payback in form of one of the Runes of Kahlil. By touching a rune, Bruno had been chosen to become a slave of Kahlil. The Messenger of Kahlil took Hammer and his thugs to Kahlil's Dimension but was later freed by the Extreme Ghostbusters.
- Mr. Hammer seems to be of English extraction. He uses common terms like "bloody" when speaking.
- Mr. Hammer has a sensitive nose and is often seen with his handkerchief.