Tinker Bell and the Legend of the NeverBeast

Fawn is reprimanded by Queen Clarion for an incident involving a baby hawk the former kept from everyone. After helping the baby hawk return to its rightful home, Fawn hears an unfamiliar roar and upon investigation, she finds a massive, unusual creature laying in a cave beneath the earth. Fawn tries to help the beast, during which, she discovers that the beast is not vicious and is moving some rocks for building purposes. Fawn stays to observe the beast, which she names Gruff, and helps it build some structures around Pixie Hollow, but has no idea why it was doing so.