Professor Utonium is a character from The Powerpuff Girls. He is the scientist responsible for creating the Powerpuff Girls (Blossom, Bubbles, and Buttercup), because his former lab monkey Jojo (current known as Mojo Jojo, the main antagonist of The Powerpuff Girls) pushed him towards a beaker of Chemical X, which caused an explosion.
My Fair Mandy
After Mandy's deadly smile destroys her original world, Grim, Billy and Mandy are transported to the city of Townsville, where they take the role of the Powerpuff Girls (Grim as Blossom, Mandy as Bubbles, and Billy as Buttercup). Once there, Professor Utonium bursts into the room of the Powerpuff Girls to communicate the news that Mojo Jojo has been cast in a movie theater without paying.