Lucky's competitive side comes out at the Frontier Fillies' Summer Outdoor Jubilee when the PALs meet the BUDs -- a group of talented young rivals.

The PALs are determined to place first in a race for the coveted Frontier Fillies Legacy Pin. But the BUDs are willing to do anything to win.

While riding back to Miradero, the girls get lost -- and Abigail's horse gets bitten by a snake! Can an old friend's skills help save the day?

After finding a majestic horse in the wild, Lucky and the girls set out to solve the mystery of where she came from -- and where she truly belongs.