You're a Good Sport, Charlie Brown 1975

A motorcross, a race of motorbikes through a series of obstacles, provides the occasion for Charlie Brown's latest attempt to win at something. He selects Linus as his pit crew and goes to a store to select a bike, and due to insufficient funds, he must settle for a tiny, run-down putt-putt. The majority of Charlie's opponents are eliminated in the race, and Charlie, wearing a makeshift helmet carved from a pumpkin, finds himself in close competition with his friend, tomboy Peppermint Patty, and the Masked Marvel (a.k.a. Snoopy, Charlie's dog).

Cast:

Duncan Watson
Charlie Brown / Franklin / Kid (voice) 

Melanie Kohn
Lucy van Pelt / Loretta (voice) 

Stuart Brotman
Patricia "Peppermint Patty" Reichardt (voice) 

Jimmy Ahrens
Marcie (voice) 

Liam Martin
Linus van Pelt / Schroeder (voice) 

Bill Melendez
Snoopy / Woodstock (voice) (uncredited)