Life always seems complicated for good ol' Charlie Brown (Noah Schnapp), the boy who always tries his best against seemingly impossible odds. When the Little Red-Haired Girl moves into his neighborhood, Charlie Brown develops a crush on her. Meanwhile, his best friend Snoopy embarks on an epic adventure in a fantasy world. As a World War I flying ace, the lovable beagle pursues his nemesis, the Red Baron, while also trying to win the heart of a beautiful poodle named Fifi (Kristin Chenoweth).