One day, while exploring, Spirit is captured by a group of horse traders led by a man named Wagoner. Spirit is torn from his family and begins a journey to find his way back home.

Along the way, Spirit meets a talkative and friendly donkey named Luck, who joins him on his quest. The duo faces various challenges, including encountering hostile animals, harsh weather conditions, and Wagoner's men, who are determined to break Spirit's spirit.

In the climax of the film, Spirit confronts Wagoner and his men, who are trying to capture the rest of the wild horses. Spirit uses his courage and cunning to outwit them and lead the horses to freedom.