Zaybo

Zaybo was a mysterious creature that accompanied the boy J-5. Whether Zaybo is a proper name or the name of the creature's species was not clarified. Zaybo was able to manifest itself visibly in a number of different forms. At rest, though, Zaybo seemed to have the form of an invisible kitten. When appearing as an alluring woman to Dr. Smith, Zaybo carried on a long conversation with him, indicating that Zaybo must indeed indeed be sentient