You're the Greatest, Charlie Brown (1979)

Plot

Charlie Brown gears up to compete in the Junior Olympics decathlon, determined to prove his worth. However, he faces unexpected competition from none other than a masked beagle, adding a humorous twist to the event. As Charlie navigates the challenges of training and rivalry, he learns valuable lessons about perseverance and friendship. With the support of his friends, he strives to overcome his insecurities and find his place in the spotlight, making this a heartwarming tale of determination and camaraderie.