Jack Samuels hated his brother, Selwyn, a famous club owner and chemist. To get revenge on him he injected himself with a concentrated dose of Q-47, the formula Selwyn had been working on, which was the same drug that gave Hell-Rider his strength. The drug transformed him into a sub-human beast man. Jack began targeting the female employees at Selwyn's Nightowl Club and was dubbed The Ripper by the press. He was stopped and killed by Hell-Rider.