Romulox is supposedly the ruler of the tar creatures and Master Shake's arch enemy. He first appeared in the episode PDA. Romulox is a blue tar monster. His skin looks extremely bumpy, which may indicate that he is composed of tar. He has two strange horns protruding from his head, and he almost always speaks in a very condescending, bored tone. In his first appearance, he was wearing women's underwear for reasons that were never explained. In The Last One, his second appearance, Romulox wore a costume that mimicked Oog's outfit. In his last appearance The Greatest Story Ever Told, he is still shown wearing Oog's style, but inexplicably changes back to his original outfit between scenes.