You're a Good Sport, Charlie Brown
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You're a Good Sport, Charlie Brown is one of many prime-time animated TV specials based upon the popular comic strip Peanuts, by Charles M. Schulz. It was originally aired on the CBS network in 1975.
Charlie Brown enters a motocross race with a run-down motorbike, a helmet made from a pumpkin, and Linus as his pit crew. Most of his opponents are eliminated, but in his last race faces Peppermint Patty and "The Masked Marvel" (Snoopy in disguise yet again).