June Bailey is a young girl with a vibrant imagination and a talent for building intricate amusement park models in her room. With help from her supportive mother, June creates "Wonderland," a magical, animated theme park inhabited by talking animal mascots. June's life takes a turn when her mother falls ill, causing her to abandon her whimsical creation. Eventually, she stumbles upon a hidden, overgrown entrance to an actual, larger-than-life Wonderland in the woods. A once-glorious place now in disarray, Wonderland has fallen into chaos under the threat of a dark storm and the destructive “Chimpanzombies.”

In this fantastical world, June teams up with her imagined animal friends—Boomer the blue bear, Greta the warthog, Steve the porcupine, Peanut the monkey, and the beaver brothers Gus and Cooper—to save the park from complete annihilation. As they explore the wonders and face dangerous obstacles, June begins to rediscover her creativity and sense of hope. She learns valuable lessons about resilience, teamwork, and the strength of her own imagination. The journey through Wonderland becomes a symbolic adventure that helps June confront her fears and reignite the joy and love she once shared with her mother.