On the hidden island of Themyscira, a paradise inhabited by the Amazons, warriors created by the gods to protect mankind, Diana, the princess of the Amazons, lives a serene life, trained to be an unconquerable fighter. Her peaceful existence is shattered when an American pilot, Steve Trevor, crashes on the shores of her homeland. Rescuing him from the wreckage, Diana learns of the massive conflict raging in the outside world: it's World War I, and humanity is engulfed in chaos and destruction. Driven by the stories her mother, Queen Hippolyta, has told her about the Amazons' purpose, and believing that Ares, the god of war, is responsible for the war, Diana decides to leave her home, convinced she can stop the threat. With her enchanted weapons, including the Lasso of Truth and her bulletproof bracelets, she sets out with Steve to find and defeat Ares.

In the world of men, Diana faces the horrors of war and discovers the complexities of human nature. As she travels across Europe with Steve, she encounters allies who help them on their mission. Meanwhile, she comes to grips with her own powers and destiny, learning about love, sacrifice, and the realities of evil. Her journey from sheltered warrior to heroic champion unfolds as she fights alongside men in the war to end all wars, ultimately discovering her full powers and true destiny.