总是闹出一堆笑话的查理·布朗（诺亚·施纳普 Noah Schnapp 配音）这一次有了暗恋的“红发小女孩”（弗朗西斯卡·卡帕尔迪 Francesca Capaldi 配音），他能否获得她的注意呢？而史努比（比尔·莫伦茨 Bill Melendez 配音）也将自己的幻想能力升级，变成王牌飞行员，飞上蓝天追逐自己的头号敌人“红色男爵”，还邂逅了梦中情人“菲菲”（克里斯汀·肯诺恩斯 Kristin Chenoweth 配音）……Charlie Brown, Snoopy, and the whole gang are back in a heartwarming story. A new girl with red hair moves in across the street, and Charlie Brown falls in love. Now he tries to impress the red haired girl to make her feel like he's a winner, but Charlie Brown just can't do anything right. At the same time, Snoopy is writing a love story about his continuing battles with The Red Baron. Then Charlie Brown has accomplished something never done before. He gets a perfect score on his standardized test, but there has been a mistake. Should he tell the truth and risk losing all of his newfound popularity? Can Charlie Brown get the girl to love him or will he go back to being a nothing?