
Professor Utonium realized that Townsville had a Supervillain problem. Upon returning to his home in Townsville, California, Professor Utonium mixed the chemical with the Mutant Gene, creating what he dubbed "Chemical X". Utonium visited the site where the Prince is said to have slain the demon Aku and discovered a strange Black Substance which he took samples of. Dominic's brother Benedict made this trip possible, having relatives there loyal to him, which would come to include "The Interesting Children from Beneath the Mountain, which would serve as enemies to the KND. Dominic began to study science, eventually he took a trip to Japan on a pilgrimage of sorts to discover more about his own ancestry, specifically a Prince who's name was lost to the ravages of time but some records give the name "Jakku". Benedict went the opposite direction and took the nickname "Father", becoming a Supervillain after somehow gaining Pyrokinetic abilities as well as some shapeshifting, while Monty stayed in England where he had found a wife, who would give birth to their son, Nigel Uno.ĭominic Utonium, now living in America, had little interest in Science until the time travelling villain Mojo Jojo, attempted to kill him and he was rescued by his future daughters, the Powerpuff Girls.

Dominic and Eugene changed their name to Utonium to prevent association with the Supervillain Grandfather. Monty led a rebellion against his father and defeated him, ushering in a new age of the Kids Next Door. Monty, Grandfather's oldest son, discovered the Book of KND, an artifact left behind by the KND before they were largely destroyed by the Triplets and Grandfather. His abiltiies allowed him to rule England and even defeat several national superheroes.

Grandfather was a member of the Black Hat organization and also may have based his moniker on Ingsoc's Big Brother persona. He went on to have four sons, Monty, Benedict, Dominic and Eugene, Grandfather for a time ruled supreme in England through the use of a strange ability to transform anyone he touched into zombielike elderlies capable of, like father, infecting anyone with a single touch. In their adults years, at least one of the triplets would have a son who became Grandfather, the greatest evil of his time, forcing all children to work in his tapioca factories. All agents were thawed out eventually but were now well over 13 and as a rule had to be decommissioned, including Numbuh Nineteenth century, his immortality being a KND secret). And when the KND sent an operative(Numbuh Nineteenth Century, who was a "Century Baby" or a child born at the beginning of every century, an immortal child, though he would be decommissioned nonetheless), inside their house to steal the cake recipe, they had rigged a trap to take out all of the operatives present. 19th century operatives did not have their numbuh stated on their uniforms.The Annoyingly Cute Triplets Who Lived Upon the Hill and their mother lived in America and repeatedly fought against the Kids Next Door, as well as prohibit anyone from tasting their delicious birthday cake.The last living member is Numbuh 19th Century, but sadly, he was decommissioned.It's evident they had yet to achieve outer space travel, as Numbuh 19th Century remarked on the great changes during his absence while being transported in Numbuh 86's S.P.R.A.Y.S.H.I.P. Their means of transportation were primarily hot air balloons. was also in use during this time, as it's unknown exactly when it was invented.

The cavalry (dressed like cowboys) rode wooden horses, spies/watchers used spyglass, and large steel cannons were brought for long rage attacks. (though, presumably a precursor to the current model) was invented by Numbuh 19th Century before failing his mission at The Alamode.

The 2x4 technology used during the Sixth Age of the KND was a lot more primative than the newer technology used in the Seventh Age. Girls were not allowed in the Kids Next Door during this period, stated by Numbuh 19th Century after awakening in the 21th Century. Operatives wore standard uniforms designated to their battalion/field, and they did not run away at the Alamode when the cake trap went off and encapsulated all kids present in ice cream frosting. The 19th Century KND were a lot more similar to a formal military than the modern version. This battle resulted in the loss of 5000 KND operatives, the famed cake recipe and the destruction of the ACTWLUTH's mansion. The 19th Century KND fought one known battle: the Alamode.
