Cletus Junior is the main antagonist from the episode, Trenchbillies. He is a trenchbilly with purple skin with long brown hair, and a southern drawl. He has suspicions about SpongeBob, Patrick, and Mr. Krabs. He really likes Krabby Patties. He also loves to fight crime, with his nephew, Jordan Klein, who is a Clownfish. He is one of the best hillbilies of the clan.
Another hillbilly Cletus can be seen as a character on The Simpsons.
Since it's too dark to see anything deep in the sea, animals who live there are blind, some having their eyes covered with a layer of skin. Cletus and his skin display this trait.