In Pixie Hollow, animal fairy Fawn discovers a mysterious and enormous creature known as the NeverBeast while exploring the forest. Contrary to his fearsome appearance, the NeverBeast, named Gruff, shows a gentle side when Fawn tends to his injuries and befriends him. However, Gruff's sudden appearance raises concerns among other fairies and prompts the arrival of the Scout Fairies, a group dedicated to protecting Pixie Hollow from potential threats. Fawn's friends, including Tinker Bell, grow worried about her safety and the possible dangers Gruff might bring to their home.

As Fawn spends more time with Gruff, she learns about his true purpose and their bond deepens despite increasing opposition and fear from the rest of Pixie Hollow. The Scout Fairies, led by Nyx, insist that Gruff poses a significant danger based on ancient fairy legends forewarning a catastrophic event associated with his kind. Determined to prove her friend’s innocence and save him from harm, Fawn faces difficult choices and challenges, balancing her loyalty to Gruff with her responsibility to protect Pixie Hollow. The narrative builds toward revealing the true nature of the NeverBeast and the crucial role Fawn must play in ensuring the safety and harmony of her world.