Steve Martino Director Noah Schnapp Charlie Brown Voice Hadley Belle Miller Lucy Voice Mariel Sheets Sally Voice Alex Garfin Linus Voice Francesca Capaldi The Little Red-Haired Girl Voice Venus Schultheis Peppermint Patty Voice Rebecca Bloom Marcie Voice Marleik "Mar Mar" Walker Franklin Voice Noah Johnston Schroeder Voice Madisyn Shipman Violet Voice Anastasia Bredikhina Patty Voice Micah Revelli Little Kid Voice A.J. Tecce Pigpen Voice William Wunsch Shermy Voice Trombone Shorty Miss Othmar Voice Kristin Chenoweth Fifi Voice Bill Melendez Snoopy & Woodstock Voice Craig Schulz Producer Bryan Schulz Producer Cornelius Uliano Producer Paul Feig Producer Michael J. Travers Producer Renato Falcão Cinematographer Randy Trager Film Editing Christophe Beck Original Music Nash Dunnigan Art Director Christian Kaplan Casting