Wonder Woman is the most popular female comic-book superhero of all time. Aside from Superman and Batman, no other comic-book character has lasted as long. Generations of girls have carried their sandwiches to school in Wonder Woman lunchboxes. Like every other superhero, Wonder Woman has a secret identity. Unlike every other superhero, she also has a secret history.
When Marston died in 1947 Robert Kanigher took over and Diana became less of a feminist character but during this time, her abilities expanded as she wore earrings that provided her with the air she needed when she was in outer space and she had an invisible plane. Extra additions included a tiara which could cut through almost anything and acted as a boomerang and her bracelets now had two way radios.
Diana lifts a tank ready to crush Doctor Poison with it, but hesitates when she thinks about the love and compassion that Steve brought to her life when she realizes that he professed his love for her before leaving to sacrifice himself. Dropping the tank, Diana spares Doctor Poison, telling Ares that he is wrong about humanity. She tells him that while humans are everything Ares says and can be capable of the worst crimes, she's learned that they are equally capable of so much more: unbridled love and compassion. Ares engages Diana in a final fight, but is defeated after she fully embraces her powers as the God Killer and blasts Ares with powerful divine lightning. The soldiers, free from Ares' corruption, stop their fighting, thereby finally ending the war.
The Invisible Plane appeared in the very first comic stories, including All-Star Comics #8, where it is shown as being able to fly at over 2,000 mph (3,200 km/h) and to send out rainbow rays that penetrate the mist around Paradise Island, as well as landing stealthily and having a built-in radio. Wonder Woman is seen storing the plane at an abandoned farm near Washington, D.C., in the barn; she goes there as Lt. Prince and changes clothes in some of the earliest tales. Though never explicitly stated, the Plane is presumably stored there when not in use for the rest of the Pre-Crisis era. In a story published shortly after, it flies at 40 miles (64 km) a second.
The Diana Prince alias also played an important role after the events of Infinite Crisis. Wonder Woman was broadcast worldwide killing a villain named Maxwell Lord, as he was mind controlling Superman into killing Batman. When Wonder Woman caught him in her lasso, demanding to know how to stop Superman, Maxwell revealed that the only way to stop him was to kill Lord, so as a last resort Diana snapped his neck. To recover from the trauma of killing another person, the Amazon went into a self-imposed exile for one year. On her return to public life, Diana realized that her life as a full-time celebrity superhero and ambassador had kept her removed from humanity. Because of this she assumed the persona of Diana Prince and became an agent at the Department of Metahuman Affairs. During a later battle with the witch Circe, a spell was placed on Diana leaving her powerless when not in the guise of Wonder Woman.