Plot
At Charlie Brown’s school, Linus Van Pelt introduces two French exchange students, Babette and Jacques, to his class. They will be spending two weeks in the United States to familiarize themselves with American culture. In a reciprocal arrangement, Charlie Brown and Linus are selected for an exchange program in France. Upon learning of his selection, Charlie Brown returns home and invites Snoopy and Woodstock to accompany him. Shortly thereafter, he receives a call from Peppermint Patty, who informs him that she and Marcie have also been chosen for the program. Additionally, Charlie Brown receives a letter from France, but he is unable to read it, as it is written in French. This causes him concern about the trip. However, Marcie, who has been studying French, translates the letter and explains that Charlie Brown has been invited to stay at the Château du Mal Voisin (House of the Bad Neighbor). Perplexed, Charlie Brown cannot understand why he has been invited, let alone how someone in France would know him.
The group first arrives in London before traveling across the English Channel to France via hovercraft. Upon their arrival, they acquire a Citroën 2CV, which Snoopy drives, as the children are too young to operate a vehicle. However, his inexperience results in him grinding the gears. Upon reaching their respective destinations, Peppermint Patty and Marcie are welcomed at a farm in Morville-sur-Andelle owned by a boy named Pierre, who immediately captures their attention. While it is evident to most that there is a mutual attraction between Marcie and Pierre, Peppermint Patty remains oblivious and mistakenly believes that Pierre is interested in her. Meanwhile, Charlie Brown, Linus, Snoopy, and Woodstock arrive at the château, which is owned by an unwelcoming baron. However, the baron’s niece, Violette Honfleur, discreetly provides Charlie Brown and Linus with food.
Determined to uncover the reason behind Charlie Brown’s invitation, Linus explores the château’s attic, where Violette reveals that during World War II, Charlie Brown’s grandfather, Silas Brown, served in the U.S. Army and once assisted her family. However, before further discussion can take place, the baron unexpectedly returns home. In an attempt to conceal Linus’ presence, Violette inadvertently starts a fire in the attic. Charlie Brown rushes to seek help from Peppermint Patty and Marcie, while Pierre alerts the fire department. Meanwhile, Snoopy and Woodstock retrieve an old-fashioned fire pump with a hose from a shed. As the fire spreads, Charlie Brown, Peppermint Patty, Marcie, and Pierre work together to rescue Linus and Violette, then assist Snoopy in containing the flames until the fire department arrives.
Grateful for their efforts in saving the château, the baron undergoes a change of heart and welcomes the group inside. There, Charlie Brown learns the true origin of the letter he received from Violette. A villager who had once traveled to the U.S. and received a haircut from Charlie Brown’s father recognized the family name and helped Violette locate Silas Brown’s grandson. As the exchange program concludes, Charlie Brown bids farewell to Violette and Pierre. He, along with Snoopy, Woodstock, Linus, Peppermint Patty, and Marcie, departs to explore more of the French countryside before ultimately returning home to the U.S.
