Zack gets a bad grade in school and Carey says he will have to go to summer school if he can't keep his grades up. However, after he finds out that Bob gets more time to complete tests because he has dyslexia, Zack pretends that he has dyslexia too. Mr. Moseby loses his voice, causing havoc in the hotel. London and Maddie play chess but London keeps winning so they keep playing until Maddie wins. When she can't, London eventually lets Maddie win.
Guest star: Charlie Stewart as Bob