Professor Utonium (voiced by Tom Kane) is a brilliant scientist who works in his home in the suburbs of the City of Townsville. A stereotypical scientist, his general attire is a white lab coat and black pants with pens tucked into the lab coat's breast pocket. The Professor once housed a chimpanzee named Jojo (later to become the girls' arch-enemy, Mojo Jojo) as a lab assistant who proved to be reckless and destructive. Jojo pushed the Professor while he was stirring his perfect girl concoction, causing him to accidentally break through a glass containing the mysterious "Chemical X" which spilled into the perfect girl formula, thus creating the Powerpuff Girls. The Professor is a genius in many fields of science, having shown knowledge in fields such as physics, chemistry, and biology as well as being a skilled inventor. Aside from his role as a scientist, he acts as a parent in The Powerpuff Girls' lives, doing fatherly things such as preparing their school lunches or cheering up the girls when they have been hurt. Although he apparently did not legally "adopt" the girls, everyone who addresses him calls him "their father" and they as "his daughters"; the girls occasionally refer to him as "our dad", and the Professor stated that he is the girls' father in many epidoes. The Professor can be strict, easily manipulated and overprotective at times, but still retains his caring fatherly image. In the episode "Keen for Keane", the girls set up Professor Utonium and their kindergarten teacher Ms. Keane on a date for Valentine's Day, resulting in the two temporarily becoming an item. They called it off after a fight due to Professor Utonium not liking cats. The character of Professor Utonium is based on J. R. "Bob" Dobbs.