Its Magic Charlie Brown (1981)

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Synopsis: Taking advantage of a newly acquired magic tricks kit, Snoopy decides to put on a magic act. For the finale, he turns Charlie Brown invisible, but he can’t change him back right away. While Snoopy searches for the counter spell, Charlie Brown struggles with this bizarre problem, but realizes that he has a golden opportunity to finally kick Lucy’s football.
Director: Phil Roman
Writers: Charles M. Schulz (created by), Charles M. Schulz
Stars: Michael Mandy, Brent Hauer, Cindi Reilly
Sources: IMDB, Wikipedia