You're a Good Sport, Charlie Brown (1975)

Plot

Charlie Brown is determined to finally taste victory in a motocross race, enlisting Linus as his pit crew. When budget constraints force him to choose a shabby, miniature bike, he remains optimistic. As the race unfolds, many competitors drop out, leaving Charlie in a fierce showdown against his friend Peppermint Patty and the mysterious Masked Marvel, who is none other than Snoopy. Sporting a quirky pumpkin helmet, Charlie navigates the challenges, hoping his perseverance will lead him to triumph in this thrilling adventure.