An experimental robot, Pulse Man serves as a proof of concept rather than a truly practical robot, an idea he resents. He and several other machines were designed to work with a new hydrogen fuel system that was based on the cardiovascular system. Though this system earned the respect of the scientific community, plans to experiment further fell through, leaving Pulse Man and the self-sustaining machines alone at an abandoned factory. Though the unusual fluid used to power the machines is currently sterile, it is easily contaminated by foreign bodies