 Lupita Nyong'oSelf - Narrator (voice) | Self - Narrator (voice) |
 Tyler James NathanCharlie Brown (voice) | Charlie Brown (voice) |
 Terry McGurrinSnoopy (voice) | Snoopy (voice) |
 Isabella LeoLucy (voice) | Lucy (voice) |
 Holly GorskiMarcie (voice) | Marcie (voice) |
 Hattie KragtenSally (voice) | Sally (voice) |
 Isis MoorePeppermint Patty (voice) | Peppermint Patty (voice) |
 Wyatt WhiteLinus (voice) | Linus (voice) |
 Christian Dal DossoFranklin (voice) | Franklin (voice) |
 Jacob SoleyPigpen (voice) | Pigpen (voice) |
| MMatthew MucciSchroeder (voice) | Schroeder (voice) |
| NNatasha NathanPatty (voice) | Patty (voice) |
 Charlie BoyleViolet (voice) | Violet (voice) |
 Kevin SmithSelf - Filmmaker | Self - Filmmaker |
 Ira GlassSelf - This American Llife | Self - This American Llife |
 Paul FeigSelf - Filmmaker | Self - Filmmaker |
 Charles M. SchulzSelf - Creator of Peanuts (archive footage) | Self - Creator of Peanuts (archive footage) |
 Keith L. WilliamsSelf - Actor | Self - Actor |
 Drew BarrymoreSelf - Actor, Producer | Self - Actor, Producer |
 MiyakoSelf - Actor | Self - Actor |
| PPaige BraddockSelf - Cartoonist / Creative Director of Creative Associates | Self - Cartoonist / Creative Director of Creative Associates |
 Jean SchulzSelf - Charles Schulz's Widow | Self - Charles Schulz's Widow |
 Jennifer Finney BoylanSelf - Writer | Self - Writer |
 Billie Jean KingSelf - Tennis Champion / Activist | Self - Tennis Champion / Activist |
 Al RokerSelf - Journalist | Self - Journalist |
| RRobb ArmstrongSelf - Cartoonist, Jumpstart | Self - Cartoonist, Jumpstart |
| CChip KiddSelf - Writer / Graphic Designer | Self - Writer / Graphic Designer |
| KKaren JohnsonSelf - Former Director, Charles M. Schulz Museum | Self - Former Director, Charles M. Schulz Museum |
 Noah SchnappSelf | Self |
 Lynn JohnstonSelf | Self |
