William Taurens was a common thug and former soldier employed by HYDRA under Gideon Malick's command. His primary task was usually to kidnap low-level targets, and bring them into HQ for Faustus Method-brainwashing to turn them into loyal soldiers of the terrorist organization like him. Daredevil and the Agents of S.H.I.E.L.D. eventually managed to prevent any more kidnappings, however, and Taurens was punished for his failure to stop them by being subjected himself to Cross-Species experimentation by several Oscorp Industries scientists. Because of reports of Terrigen crystal mist being found within a large amount of Fish Oil pills, Malick made it imperative that the experimentation conclude with Taurens being force-fed a pill on the basis that he might undergo Terrigenesis to become an Inhuman. To his satisfaction, the combined mixture of Bull Cross-Species DNA and the Fish Oil pill resulted in Taurens mutating into a humanoid bull-like Inhuman. The newly renamed Man-Bull has since gone on to serve as an enforcer in Baron Zemo's Masters Initiative.