Dr. Vile

Dr. Vile is a mad scientist from The Little Mermaid series who tried to capture Sebastian and use him for his sinister crab experiments until Sebastian started bonding with his young good-hearted apprentice, Daniel in the episode; "Island of Fear." His electric waterwheel was responsible for polluting the ocean which caused everyone to fall sick until Ariel found a way to destroy it by throwing a monkey wrench at it.