In a futuristic world almost barren of life, mankind is confined to mechanized domed cities where A.I.’s control all aspects of life. In this world, humans are no longer born, they are manufactured in a production line; and alongside them live androids known as autoreivs. Within one of these domed sanctuaries named Romdeau lives Re-l Mayer, one of a few citizens who aren’t entirely prevented from thinking. Her grandfather's prominent position and the affection of the scientist Daedalus have left her more free will than is normally allowed, but Re-l has started to question the sanctity of the city and the citizens' perfect way of life. With mysterious beings known as proxies causing havoc and a man named Vincent causing great influence on her life, Re-l must travel outside of the city to find the answers she seeks and discover the mystery behind "the awakening".
Both shows are set in a similar world and have similar themes through the story. White they each presents their own ideas and conclusions. In the end, they are about survival. If you enjoy one show you will enjoy the other one, however, DT Eightron is from 1998 and Ergo Proxy from 2006, so don't expect the same quality of animation and I would't be surprised if Ergo Proxy was inspierd by DT Eightron at all.