Kenny was created by Phineas Mogg and designed to be a teenager. However, Mogg added canine-like qualities to Kenny (i.e. superior scent, hearing, howling, barking, chasing cats) thinking it would make him superior to XJ-9, hence his model name YK-9. Kenny and Jenny began dating after she met him by a fire hydrant, which he was staring at intently. Jenny and Kenny's relationship made Sheldon jealous, causing him to do everything in his power to expose Kenny's secret, often failing. As the episode progresses, Jenny soon finds out that Kenny is part-dog, which results in a nightmare of her future with Kenny (living in a giant doghouse, robot puppies, Kenny being caught by the dog catcher), leading to Jenny questioning whether or not she should break up with him. However, due to Kenny's popularity among her school peers, Jenny decides to give Kenny another chance... until Sheldon soon learns Kenny's secret and exploits it at the end of the episode.
AppearanceKenny bears a large physique, possibly similiar to that of a football player or professional martial artist. His metal skin is white, like Jenny's, and his "hair/ears" and "clothes" are indigo. When in teenager mode, his mechanical ears are laid down to resemble hair, but in dog mode they lift up from his head and appear triangluar, like dog ears. In his dog mode, Kenny bears a resemblance to a bulldog, being large and bulky with a big lower jaw. Dr. Wakeman accused Dr. Mogg of stealing the design plans of XJ-9 to construct him.
Dr. Mogg is Kenny's creator. The two have an odd dynamic that is both parent-child and master-pet, due to Kenny being programmed to act as both a teenage boy and a dog. When Kenny is acting like a teenager, he treats Mogg like his father. When he is acting like a dog, Mogg treats him like a pet.
- Y and K are both of the letters right after X and J, respectively.
- His "name" Kenny is copied from Jenny's name but the J was changed into a K which ironically is after the letter J in the alphabet.