Peterotica

"Peterotica" is the twenty-fourth episode of the fourth season of, and the 74th episode overall. It first aired on April 23, 2006.

Synopsis
"After reading an erotic novel, Peter decides to write one of his own and gets Carter to publish it. But when Carter gets sued for Peter's book on tape, he loses all his money and is forced to become a middle-class citizen, much to his chagrin. Meanwhile, with the flick of a switch, Chris becomes a genius and competes with Stewie to take over the world."

- The Futon Critic