Lupita Nyong'o as Self - Narrator (voice)

Tyler James Nathan as Charlie Brown (voice)

Terry McGurrin as Snoopy (voice)

Isabella Leo as Lucy (voice)

Holly Gorski as Marcie (voice)

Hattie Kragten as Sally (voice)

Isis Moore as Peppermint Patty (voice)

Wyatt White as Linus (voice)

Christian Dal Dosso as Franklin (voice)

Jacob Soley as Pigpen (voice)

Matthew Mucci as Schroeder (voice)

Natasha Nathan as Patty (voice)

Charlie Boyle as Violet (voice)

Kevin Smith as Self - Filmmaker

Ira Glass as Self - This American Llife

Paul Feig as Self - Filmmaker

Charles M. Schulz as Self - Creator of Peanuts (archive footage)

Keith L. Williams as Self - Actor

Drew Barrymore as Self - Actor, Producer

Miya Cech as Self - Actor

Paige Braddock as Self - Cartoonist / Creative Director of Creative Associates

Jean Schulz as Self - Charles Schulz's Widow

Jennifer Finney Boylan as Self - Writer

Billie Jean King as Self - Tennis Champion / Activist

Al Roker as Self - Journalist

Robb Armstrong as Self - Cartoonist, Jumpstart

Chip Kidd as Self - Writer / Graphic Designer

Karen Johnson as Self - Former Director, Charles M. Schulz Museum

Noah Schnapp as Self

Lynn Johnston as Self