During this season, the guys head to Korea, after Quagmire is found to be a Korean soap-opera star, Chris becomes a registered sex offender, Stewie has a nightmare and sends Brian into his mind to find the root of the problem, Peter and Lois buy a new mattress ("Guy, Robot"), Stewie and Brian open an Italian restaurant and are met by Frank Sinatra, Jr., Peter accidentally gets the drinking age raised to 50 ("Underage Peter"), Brian and Stewie get hooked on Adderall ("Pilling Them Softly"), and Peter meets his long-lost sister ("Peter's Sister").