Boon Boon angers her father when she tells him she intends to choose Thowra as a partner and the Brolga immediately issues a challenge to Thowra. The Prospector is leaving the high country to move south to live with his son and grandson Charlie. Thowra defeats the Brolga, claims his title as King of the Cascade Brumbies, and banished the Brolga from the High Country.
Thowra goes off to do some thinking and must leave Arrow in charge of the herd. An arrogant Brumby calling himself the "Prince of the West" arrives in the high country looking for a mate. The Man and a friend pursue the herd, nearly catching the new brumby who the Brolga later chases out of the high country.
Spring has arrived. An earthquake hits and a cave-in traps Baby Wombat in the burrow. Arrow escapes from the Man by hiding in the hidden cave behind the waterfall. Thowra follows him in when Arrow gets lost and after he drinks from the Pool of Wisdom, Thowra sees his father who tells him his destiny to be King of the Brumbies is ready to unfold. The Brolga hopes to confront Thowra and Arrow in the cave.
With the cold winter weather setting in, the Brolga takes his herd to the warmer foothills. Yooralla and his friend Narrabri becomes stuck at the bottom of an icy canyon while Wombat gets trapped when the ice on a frozen pond breaks up. Arrow tries to lead two of the Brolga's fillies to the low country.