Fawn (voiced by Ginnifer Goodwin) rescues a baby hawk with a broken wing. Once it recovers, she, with the help of Tink, attempts to hide it from the others fairies on their trip taking it back to the forest, as grown hawks eat fairies and everyone is afraid of them. But, their hiding attempt fails and the baby hawk is revealed. The adult hawks hear its calls and arrive to attack and to reclaim the baby, but the scout-fairies are able to fend them off. Fawn is reprimanded by Queen Clarion for following her heart and not her head. After helping the baby hawk return to its rightful home, Fawn hears an unfamiliar roar and decides to fly to the depths of the forest to investigate. She finds a massive, hideous, strange creature that has never been seen before, laying in a cave beneath the earth. It has a thorn stuck in its paw and Fawn tries to get it out for him, but he “blows” her out of his liar with a powerful snort of air. But Fawn is determined to get the thorn out, so later when the beast emerges from its slumber, she manages to get it out. She realizes the beast isn’t vicious, it just simply goes along with its business: a strange behavior of moving rocks and boulders into a pile formation. Fawn stays to observe its behavior, and she surmises that it has traits similar to many different animals she’s encountered, such as thick legs for digging and wie, powerful jaws for carrying heavy weight. Eventually she names him Gruff. She helps Gruff as he builds four identical, giant rock towers, one in each season of Pixie Hollow. All the while Fawn tries to figure out why he’s doing it.
Meanwhile in Pixie Hollow, an ambitious scout fairy named Nyx (voiced by Rosario Dawson) also heard the roar, and decides to investigate. She too happened upon the beast and does research in the fairy lore library to find out what she’s up against. Using some pieces of information gathered from several torn pages of an undisclosed animal-book, she discovers that Gruff is a creature that awakens about once every thousand years, where it will transform into an even more ferocious beast that could destroy Pixie Hollow with a mysterious series of events that leads to a deadly storm.
Fawn reveals Gruff to Tinkerbell, Silvermist, Vidia, Rosetta, and Iridessa and explains how he isn’t aggressive, but friendly. She wants to show him to the Queen and demonstrate that he isn’t a fairy-eating monster. But her plan goes wrong when she approaches Queen Clarion, because Nyx got to her first and already presented the information of how this gigantic animal called the NeverBeast appears every 1000 years with a massive storm that could destroy Pixie Hollow. Fawn decides not to tell the Queen about Gruff. She is horrified of the legend but is confident that it all is just a big misunderstanding.