Mr. Wiggleplix is an invisible hedgehog who only appears in the Back at the Barnyard episode of the same name. He is Pig's imaginary friend, but because Pig is the only one who can see him and he can only become visible when flour is poured on him, everybody else initially thinks he is not real. In the episode, Pig believes that Otis accidentally killed Mr. Wiggleplix, but in the end, he is revealed to be alive and well. He is wears a top hat, a buttoned vest, and loves to ride his bike.