Professor Zane
From Loonipedia
Prof. Zane was a mad scientist who created the "bio-pet" "Fuz-Z" from lifeforms released by the meteor. Zane modified these lifeforms so that they grew enormous and monstrous after eating chocolate, and planned to unleash them on the world. He was originally kicked out of the science community by the Acmetropolis Science Council, believing his work too dangerous. The Loonatics were able to stop Zane and he was thrown in prison while the Fuz-Zs were dumped into a crater. He was last seen at the end of "A Creep in the Deep" as one of the imprisoned supervillains.