Kuro-chan, a "watchcat" for an old couple, is, one day, kidnapped by Dr. Go, an evil scientist. Dr. Go transforms Kuro into a cyborg cat. However, the new Kuro-chan is not loyal, and escapes Dr. Go's laboratory as well as destroying it. He then uses his cyborg body, along with weapon technology, to fight various evil villains, such as other robot cats, and aliens.
