ClayFighter 2: Judgement Clay
Although Dr. Kiln doesn't make an appearance in the game, he is mentioned in the instruction manual to be the one who's responsible for starting the game's plot. After hearing about the clay meteor which fell in Mudville in the previous game, he decided to spread around some of the meteor's magical goo and create more clayfighters with it. After this act, he decided to host the C-2 tournament, with the grand prize being the leadership of Mudville.
ClayFighter 63 1/3
Taking place in the Isle of Klaymodo, Dr. Kiln decides to team up with Houngan, the evil witch doctor, to create more fighters. Unbeknownst to Houngan, Dr. Kiln is using a part of Klaymodo's meteor to create a mutagen to help him to take over the world.
Once Houngan finds out about Dr. Kiln's mutagen, a fight breaks out between the witch doctor and the mad scientist. During their scuffle the mutagen container breaks and the goo hits Kiln's hand. As his hand starts to mutate and develops a sentience of its own, he is forced to amputate it.
After his hand escapes following the incident, Kiln replaces his hand with a prosthetic limb with the power to turn into an assortment of dangerous weapons and tools.
His disembodied hand, High Five, is one of the unlockable fighters in ClayFighter: Sculptor's Cut.