Charlie Brown goes away to camp and shares a bunk with an unfriendly kid who just sits on his bunkbed with his back to Charlie Brown and says "Shut up and leave me alone!" Lucy "breaks up" with Schroeder, after he disses her (his telephone operator routine is a scream, you'll have to see the cartoon for yourself!). Linus reluctantly takes Sally to play tennis but it ends after Sally tells the big kids off! Snoopy "helps" Linus kick the blanket habit but Linus is, naturally, not too appreciative of the approach used. Charlie Brown and the gang play a game of "Ha Ha Herman" (sort of a form of hide and seek) and Peppermint Patty denies she has a crush on her "Chuck," unknowing that Charlie Brown has heard all! Marcie (after making a cameo under a different name many years ago) is formally introduced and gives Peppermint Patty the nickname "Sir." Thus, Peppermint Patty has a new expression: "STOP CALLING ME SIR!" She also wears a dress for the 1st time after her school enforces a dress code. Joe Cool (an alter ego of you-know-who) also makes his debut.