a highly trained warrior trained in many different areas under numerous teachers in a variety of skills to defeat the demon aku. however, aku sent jack eons into the future, where aku ruled all of Earth unopposed. jack made it his mission to go back to the past and prevent aku's dystopia. jack became an infamous freedom fighter throughout his travelings, protecting and aiding numerous civilizations and innocents terrorized by aku's forces and other malevolent opponents.