The Dorudon is a prehistoric whale that only appears in the episode "Ugh."
The Dorudon is mainly purple in color. Its body highly resembles that of a whale. It has large light blue stegosaurus-like scales on its back and very short fins. It also has two small eyes with thick eyebrows. A few razor-sharp light yellow teeth can be seen jutting out of the lower jaw of its wide mouth. The top of its head consists of a blowhole and at least three hair-like growths. Its skin is detailed with scales.