As summer approaches, Charlie Brown is preparing to go off to summer camp with Snoopy, Linus, Marcie, and other children. Peppermint Patty, however, must attend summer school due to her poor grades, much to her dismay. Before the trip, Rerun van Pelt finds a jar of marbles his grandfather Felix once owned, and decides to bring the marbles to camp in the hopes of learning how to play. Once they arrive at camp, the kids meet Joe Agate, who begins bullying them.

On his way to the camp's trading post to buy a lollipop, Rerun sees Joe defeat another boy in a game of marbles. Rerun asks Joe if he can teach him how to play, and Joe agrees on the false pretense of teaching him the game. Joe easily defeats Rerun, and proceeds to claim the game was for keeps to take away of all his marbles. Heartbroken, Rerun explains to Charlie Brown what has happened. Disgusted, Charlie Brown vows to win back the marbles and isolates himself in the boathouse, where Snoopy (as alter ego Joe Cool) instructs him on the game until he becomes skilled enough to defeat Joe.

Meanwhile, back home, Peppermint Patty suspects that Charlie Brown has become Marcie's love interest. Her temper flares when Marcie begins teasing her over the telephone. Patty, overcome with jealousy, hatches a plan to leave town and interrupt Marcie's supposed romance, but when she arrives at camp she learns that nobody has seen Charlie Brown in days.

On the last day of camp, Charlie Brown has Snoopy summon the other campers to the trading post. There, Charlie Brown challenges Joe, exposing his unfair ways of playing to the others: he only plays with beginners, pretends to play for fun until he wins, at which point he claims keeps and steals all the campers’ marbles. Charlie Brown gives Joe a clear warning that this match is to the death. Everyone watches the two compete; initially, Joe wins and takes all of Charlie Brown's marbles, but Snoopy provides two spares. Joe reluctantly starts the game over and takes out one marble, but then attempts a trick shot and misses. Charlie Brown shoots and wins the last marble, along with Joe's shooter. Charlie Brown makes another bet; if Joe wants his shooter back, they should play for all the marbles. Joe is unsure why he would agree to such a lopsided deal, because Charlie Brown only has three marbles and he has numerous. Charlie Brown says that should he miss a single shot, regardless of how many he’s won, Joe takes back all the marbles. Joe, feeling unbeatable at that bet, agrees. Ultimately, Charlie Brown wins all the marbles in a single turn, much to Joe's flabbergastment. Charlie Brown declares he return the marbles to their owners, including Rerun; Joe honorably concedes all of the marbles and leaves in defeat. Marcie celebrates Charlie Brown's victory by kissing him on the cheek much to Patty's jealousy. When the kids return home, Charlie Brown is delighted by Lucy's bitter denial at his victory.

At home, Patty asks Marcie what she did with Charlie Brown at camp. Marcie explains that there was the Moonlight Walk, before she says, "It wasn't really a walk. We just got started before Charles walked into a tree."

During the end credits, Snoopy and some birds sleep on tents, while Woodstock roasts a marshmallow and sings.

• Spencer Robert Scott as Charlie Brown
• Stephanie Patton as Lucy van Pelt
• Taylor Lautner as Joe Agate, the bully
• Rory Thost as Peppermint Patty
• Jessica Gordon as Marcie
• Jimmy Bennett as Rerun van Pelt
• Benjamin Bryan as Linus van Pelt
• Bill Melendez as Snoopy, Woodstock
• Jolean Wejbe as Violet
• Paul Butcher, Jr. as Roy

Patty, Frieda, Schroeder, and Pig-Pen also appear in this special, but do not speak. Sally is credited erroneously as being voiced by Sierra Marcoux; she never speaks during the special.

The storyline He's a Bully, Charlie Brown was an amalgamation of several different series of Peanuts strips; the "Joe Agate" storyline originally appeared in the strip in 1995, and the story involving Peppermint Patty sneaking away from summer school to see Charlie Brown at camp was an adaptation of a series of strips from 1989.

This was the first and only Peanuts special to use CGI for one sequence, when the school bus pulled up to the camp.

Music score edit

As with It's Christmastime Again, Charlie Brown and You're in the Super Bowl, Charlie Brown, jazz pianist David Benoit performed and arranged the music score consisting of variations of songs originally performed by jazz pianist Vince Guaraldi. Guaraldi composed music scores for the first 16 Peanuts television specials and one feature film (A Boy Named Charlie Brown) before his untimely death in February 1976.^[4]

All songs written by Vince Guaraldi, except where noted.

This special aired on ABC on November 20, 2006, following a repeat broadcast of 1973's A Charlie Brown Thanksgiving.The show won their time slot with 9.4 million viewers, beating out a Madonna special on NBC.^[5]

The special released on DVD as a bonus special in the remastered deluxe edition of You're Not Elected, Charlie Brown on October 7, 2008, by Warner Home Video. On October 6, 2015, Warner Home Video released the special on its own DVD with It Was a Short Summer, Charlie Brown and an episode from The Charlie Brown and Snoopy Show as bonus specials. The special began streaming on September 9, 2022, on Apple TV+ as part of The Peanuts Classics Collection.^[6]

• He's a Bully, Charlie Brown being shown at the Schulz Museum on 28 October 2006
• He's a Bully, Charlie Brown at IMDb