Kuro and his owners are invited to a contest at a local store. Kuro, however, realizes this as a ruse set up by Dr. Go and his army of robot cats.

Dr. Go creates a chip that allows Mi to penetrate metal objects and transform them at will. Mi goes out of control with this and eventually becomes a mechanically engineered automobile, which Kuro cannot defeat alone.

Dr. Go constructs two robots: Big Sam and Little Sam. He accidentally sets off a self-destruct bomb and is trapped inside. Kuro and Mi work together to try to deactivate the bomb and save the doctor, who, by that time, has already escaped.

Mi falls in love with one of the dogs in the neighborhood, but he does not have the courage to speak to her, and he disguises himself as a dog to try to do so. Meanwhile, another of Dr. Go's inventions causes chaos, and endangers the dog.