Pluto.

In this daring reinvention of "The Greatest Robot on Earth" story arc from Osamu Tezuka's Astro Boy series, the world is a place where humans and robots coexist. The lives of the seven great robots of the world--Atom, Mont Blanc, North No. 2, Brando, Hercules, Epsilon and Gesischt--are turned upside down into a virtual garden of terror filled with carnage and destruction. A killer is after them, but what exactly is his motive? The story intensifies when Pluto, the namesake of the lord of the underworld, makes his appearance in this finely crafted work of science fiction and suspense.