Wonder Woman and Hermes briefly returned to Themyscira so that Diana could pay her respects to her petrified mother. When they got back to her apartment, they found Hera crying and mourning the days when she used to be a goddess. As Diana comforted her, she realized she would need help in finding Zola and Zeke. Wonder Woman went to the Taiga, Siberia, where she asked Artemis for her help. Artemis agreed, on the condition that she and Diana have a rematch. Knowing they are in Artemis' realm, Diana threw the fight in Artemis' favor.
At the end of the 1960s, under the guidance of Mike Sekowsky, Wonder Woman surrendered her powers in order to remain in Man's World rather than accompany her fellow Amazons to another dimension. Wonder Woman begins using the alias Diana Prince and opens a mod boutique. She acquires a Chinese mentor named I Ching, who teaches Diana martial arts and weapons skills. Using her fighting skill instead of her powers, Diana engaged in adventures that encompassed a variety of genres, from espionage to mythology. This phase of her story was directly influenced by the British spy thriller The Avengers and Diana Rigg's portrayal of Emma Peel.
In one episode, a newspaper editor named Brown, desperate to discover Wonder Woman’s past, assigns a team of reporters to chase her down; she easily escapes them. Brown, gone half mad, is committed to a hospital. Wonder Woman disguises herself as a nurse and brings him a scroll. “This parchment seems to be the history of that girl you call ‘Wonder Woman’!” she tells him. “A strange, veiled woman left it with me.” Brown leaps out of bed and races back to the city desk, where he cries out, parchment in hand, “Stop the presses! I’ve got the history of Wonder Woman!” But Wonder Woman’s secret history isn’t written on parchment. Instead, it lies buried in boxes and cabinets and drawers, in thousands of documents, housed in libraries, archives and collections spread all over the United States, including the private papers of creator Marston—papers that, before I saw them, had never before been seen by anyone outside of Marston’s family.
The Lasso of Truth forces people to tell the truth. It was forged by Hephaestus from the Golden Girdle of Gaea that Antiope had once worn. It is able to restore people's lost memories get rid of illusions or cause illusions to those it holds and heal the holder's body cure insanity and protect people who are in close proximity to it from magical attacks. In the golden age version the lasso could also take on a rigid form and hold people aloft from a great distance away. During these eras, the lasso also forced those who were bound by it to act as the holder demanded. This trait also affected Wonder Woman. A non-combat application of the lasso is that it can be used to change Diana's clothes as long as those clothes are "in the right frequency" as the lasso. Although this was a plot device used more often in the golden and silver age in has been used on occasion in modern comics as for instance one time Diana transformed into a Miss America costume. The lasso is essentially indestructible, and can be offensively used in combat to incapacitate, and even attacking their souls.
In Wonder Woman Vol. 1 #204, Diana's powers and costume were returned to her and she is once again reinstated as Wonder Woman. I-Ching is killed by a crazy sniper in the same issue. Later, Diana meets her sister Nubia, who is Hippolyta's daughter fashioned out of dark clay (hence Nubia's dark complexion). Nubia claimed to be the "Wonder Woman of The Floating Island", and she challenges Diana to a duel which ends in a draw. Returning to her home, Nubia would have further adventures involving Diana.
The success of the superhero television series Supergirl informed the marketing and promotion strategy used for Wonder Woman. According to Time Warner chief marketing officer Kristen O'Hara, they wanted to approach the Wonder Woman marketing campaign in a light manner, similar to how they did with Supergirl. O'Hara elaborated that the modest campaign route they took for Supergirl aided in establishing a large central fanbase among women well in advance of the series, which reportedly generated 5 million female superhero fans in one week. They were then able to model over time, and grow that audience leading up to the 15-months-later release of Wonder Woman. Though neither the film nor the series are aimed exclusively at women, the latter's campaign gave them their first opportunity to begin collecting data about female superhero fans. In May 2017, a promo for Wonder Woman was released during the season finale of Supergirl, featuring a remix of the song "These Boots Are Made for Walkin'" and Supergirl (Melissa Benoist) wearing Wonder Woman's boots. The promo included an appearance by Lynda Carter, star of the 1970s Wonder Woman, who plays the American president on Supergirl.
Diana then arrives to stop Ares, and brings Steve Trevor to the US.Arriving in Boston, she meets Professor Julia Kapatelis. After fighting a monster named Decay sent by Phobos, a son of Ares, Diana, Julia and Steve discover Ares' plan: to start a nuclear war worldwide. Joined by Steve's friend Michaelis, the group travel to the military bases Ares' minions had taken control of and avert nuclear war. Ares