In Part Three, entitled "The Last Fight," gangster Santer Jr. attempts to seize an oil well on Indian territory. To prevent this, Winnetou and Old Shatterhand must reconcile the warring Indian tribes so that they can take up the fight against the henchmen of the criminal.

In this movie set in the 1900s, Winnetou, a Native American hero, embarks on an exciting adventure in the Wild West. Along with his friends, he sets out on a quest to find the secret treasure hidden in the Silver Lake.

In the late 1800s, a skilled engineer working for a railroad company forms a friendship with Winnetou, a Native American chief. They face challenges such as collapsing bridges, violent conflicts, and the greed of the railroad company. Together, they fight for justice and preserve their way of life.