Born Free! Among a patterned herd of wild Appaloosa mustangs running free in the Idaho wilderness lives Blue, a spirited filly the color of rain. Surrounded by her family, including her gentle sister Doe, and protected by her father, the band stallion, Blue lives a life both harsh and beautiful in the rugged terrain of an undiscovered habitat. That all changes, though, when Blue and Doe are captured by rogue cowboys, setting in motion a chain of events that threatens the very survival of their hidden, secret herd.