[en] In the Apology, Plato gives a philosophical answer to critics contained in Aristophanes' Clouds. However, through Socrates, The Clouds target Protagoras too. As a matter of fact, Plato composed an apology for him, as well in the Theaetetus, that answers the charges in the comedy against Protagoras, becoming in a certain way his << lawyer >>. But why and what for ? Analysing the concepts of geloion and comic mimesis, we show how Plato undertakes to give a philosophical reading of Protagoras' thought, which, in the same time, constitutes a critical thinking about the object of comedy.