The Phantom Stallion's new foal is ready to be born, and River Bend Ranch's own Dark Sunshine is the mother. Samantha couldn't be more excited, and she's sure she can handle the new baby while everyone is gone on the annual cattle drive.

But when a dangerous thunderstorm hits the ranch, Sam realizes that maybe she can't do it. all alone -- especially when the Phantom arrives, and seems to want to take his new filly back to the wild.