Deichtine gives birth to a son, who is called Setanta. The boy grows brave and strong. As a child, he goes hunting and falls into the hands of a tribe of small people inhabiting the hills. Local people believe that small people are supernatural beings. The boy receives their friendship and support, which will be useful to him in the future.
Soon, Setanta gets his nickname Cu Chulainn, which means Culann's Hound. The boy in the battle defeats the mad dog. After he goes to the forest, where he meets a white deer. Setanta learns the secret of his origin. His real father is the god Cernunnos. Cernunnos promises to look after his son and help him.
Young Setanta is engaged to the beautiful Emer. After that, he and his friends go on military training to a remote mountain castle. Friends go through many adventures along the way and meet various mythical creatures.
Setanta becomes a skilled warrior and participates in battles with the legendary Queen Medb, the Queen of Connacht. Soon the glory of his military prowess spreads throughout Ireland. He manages to defeat the dark forces and resist the magic of Fedelm, the prophetess of Queen Medb, with the help of the god Lugh.
However, the war with Queen Medb begins with renewed vigor. She captures the beautiful Emer and her family. Medb finds new allies, and blood stains the land of Ireland. However, the gods are on the side of young Setanta. And they intend to destroy the rebellious Queen and restore peace to the ancient land.
And in the long-suffering land of Ireland, peace will finally reign.
And the sacred city of Tara will rise from ruins and ashes.
And the stone Lia Fail will utter a cry saluting the real king!