This series was pretty awesome, I'll admit. The dangerous and unstable world built from these microscopic robots named nanites that causes people to kind of mutate into monsters were immersive and made some creative designs of those monsters.
As the main character we have the teenage boy Rex who works for this police force called Providence, because he is the only one able to cure the nanites and bring these mutated people back to their normal self after the big event causing everyone and everything on the planet to be infected by them. At the same time Rex does not know about his past, who he was before becoming a soldier of Providence, and therefore he'll keep you interested throughout the show.
But he is not the only well rounded character in this show, because there are many cool characters in here with enough back story to them to make them interesting and engaging in there actions. The wisecracking monkey Bobo may be the least interesting of them and serves more like a comic relief character, but Agent Six, White Knight, Dr. Holiday and Circe are worth paying attention to.
There are more to see in this series, because aside from the main villain Van Kleiss, we get different kinds of recurring villains of which some are seen more often than others. Nonetheless, they are well acted and can be intimidating in their designs, but no graphic violence is in here so don't be scared to let ten-year-olds or so watch it.