The adventures of the magnificent silver colt Thowra, son of the mighty Yarraman who is destined to become king of all the wild horses. The intelligent, courageous Thowra, his brothers Storm and Arrow, and their friends the bush animals have only one enemy, the Mountain Men. The men want to capture the wild horses and take away their freedom.
A fire breaks out near Golden's corral when Currawong tries to steal a mirror from the Man's hut. Thowra, Wombat and Currawong work to save Golden while Boon Boon and Mopoke locate the Man who returns and is able to save his hut with some help from the Prospector.
A lion escapes when a truck carrying circus animals crashes in a storm. The trappers return once again to recapture the lion but not before it terrifies the animals of the high country who take it upon themselves to capture it.
Yooralla and his friend Yuri become trapped in a gorge with a rising river when a rain storm hits and a bolt of lightning causes a landslide, blocking off the stream. Currawong and Mopoke trade places.
Aranda, one of the Brolga's mares, falls down a ravine and becomes trapped on a ledge after chasing after two young foals who were spooked by a snake. The Brolga meanwhile is eager to fight Thowra and chases after him. Mopoke leads Aranda to safety and the Brolga is injured trying to help out.
Charlie's father organises a brumby round-up with a friend but doesn't count on Charlie intervening to save the brumbies from capture. Arrow returns to the high country.
Eee, Wombat, and Arrow have a painful encounter with an echidna. The Emus find an egg, and Eee thinks it is hers, but a surprise is in store when Currawong tries to steal it. The creatures of the high country give the Prospector a gift.
The season's first snowfall comes to the high country. The Man's prize bull escapes and terrorises the creatures of the high country. Arrow has designs on driving the bull out of the high country. Thowra leads the Man to his Bull and rescues him from an avalanche.
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.
When the Prospector's hut gets buried in snow, Thowra goes for help. Benni takes his family south.
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.
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.
The herd is growing weary of Arrow's leadership and looks forward to Thowra's return. Hearing that Thowra is on his way back, Arrow takes the herd to Misty Lake where a mysterious water creature frightens Yooralla and Arrow.
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.
