It's the Pied Piper, Charlie Brown

At the start of the special before the opening title credits are shown, Snoopy is using music to play a concertina on top of his doghouse, but he falls off and the concertina smashes on him. Charlie Brown is making dog food, Sally tells Snoopy to get his feet off the table and stop ringing that cell phone and then to stop ringing the door bell, Charlie Brown asks Sally if she has glasses, but she doesn't have optical equipment. It's the Pied Piper, Charlie Brown is a retelling to Sally by Charlie Brown of the story how the Pied Piper of Hamelin (portrayed by Snoopy as the Pied Piper Beagle) chased away all the mice (changed by Charlie Brown from rats because, upon the story saying that the rats fought the dogs and killed the cats, Sally is terrified of rats) from the city of Hamelin, The mice play basketball, football, baseball, hockey and other sports, the mice get all over Charlie Brown, causing him to cough, after that, Schroeder plays piano during mice invasion, but suddenly, a mouse jumps on the piano and frightens Schroeder, this causes the mice to dance and play "Chopsticks" on his toy piano. The mice dance to the funky music to lure Franklin, Marcy, Violet and Pigpen away, At the city hall, Charlie Brown, Lucy, Linus and Sally follow a TV crew into the mayor's office. The Peanuts gang substitute some characters, Snoopy being the Pied Piper Beagle with his contract being for a year's supply of dog food. When Snoopy plays a concertina (with David Benoit doing the honors), he lures the mice away from the city hall and the mice follow him out of town and into the distance, The woman claps to the beat, and the sun is about to set, once Snoopy and the mice are gone, the bells ring and the music gets faster as the mayor and his council members are put under a spell and dance to the faster tempo. Charlie Brown warns the mayor and his council that anyone that refuses to pay should pay in other ways, so Snoopy plays a long note on his concertina and does it to the mayor, when the mayor and his council refuse to pay for Snoopy's years supply of dog food, they laugh, but suddenly, they hear Snoopy playing his concertina again and the mayor and his council become bewitched. Instead of bringing Charlie Brown, Sally, Linus, Lucy and the other Peanuts gang out of town with his music, Snoopy does it to the mayor and his council and brings them out of town, the mayor and his council members dance to the tune of "Snoopy the Pied Piper Beagle", follow him out of town and into the distance where they then sing the song "Down By The Old Millstream by Randy Crenshaw, Neil Ross, Michael Mishaw, Gene Morford and Don Shelton", part of its lyrics "Not the river but the stream", "Where I first met you", "With your eyes of blue", "That you loved me true", "You were sixteen", "My village queen", and "By the old millstream", never to return again, once the mayor and his council members disappear by Snoopy's concertina playing seen in the shadow of the sunset, day turns into night as the mayor and his council members are seen by a campfire, in which they then sing the song "Goodnight Sweetheart" and they then go to sleep by the fire pit, there's also tents and a moon there. When Charlie Brown finishes his story "A Promise is a Promise", little sister Sally does not think it would happen in real life. When they hear music and look out the window to see what it is, they see Snoopy the Pied Piper Beagle on his doghouse using music to make a bewitched Linus, Lucy, Franklin and Peppermint Patty dance around his doghouse, Lucy waits a long 30 seconds enough to shout in a rough manner "Charlie Brown, get your stupid dog to stop playing this music!" and Linus, Lucy, Franklin and Peppermint Patty continue dancing, but after that, the special draws to a close.

There's also a special presentation called "An American Classic, Peanuts" featurette about a documentary of a tribute to the Peanuts gang's all time creator Charles Schultz at the end of the VHS release, but on the DVD release, it can be shown on the "Special Features" menu.

• Quinn Beswick - Charlie Brown
• Ashley Edner - Sally Brown
• Corey Padnos - Linus van Pelt
• Rachel Davey - Lucy van Pelt
• Frank Welker - The Mayor (speaking voice)
  • Randy Crenshaw - The Mayor (singing voice)
• Neil Ross - Interviewer/Townsperson/The Mayor's Council (speaking voices)
  • Michael Mishaw, Gene Morford, and Don Shelton - The Mayor's Council (singing voices)
• Pat Musick - First Woman
• Joan Van Ark - Secretary
• Bill Melendez - Snoopy/Woodstock/Mice Sounds

Violet, Peppermint Patty, Schroeder, Pig-Pen, Marcie, and Franklin also appear but have no lines.

It's the Pied Piper, Charlie Brown breaks Peanuts tradition in that it shows adults, who speak audible language. Other notable examples are the This is America, Charlie Brown miniseries, which portrayed adult historical figures alongside the kids, as well as Life Is a Circus, Charlie Brown (1980), which featured a talking circus announcer.

• It's the Pied Piper, Charlie Brown at IMDb