Basically, Motorcity is a story about a derelict Detroit, called Motorcity, that has a new, futuristic city Detroit Deluxe built on top of it. Unfortunately, the city is ruled by Abraham Kane (Abe Kane for short, if you get the reference), a tyrant obsessed with control over his citizens and the complete destruction of Motorcity, as well as forcing its inhabitants to live under his rule. Thus, a few rebels and resistance fighters in Motorcity fight back against him and his army of soldiers and robots as well as keep Motorcity safe as much as they can despite how rundown their home is.
Don't think this as some Hot Wheels clone of a show, this is a dang good series.