

Minerva and Prince help the FBI identify some antiques stolen from a heist foiled by Wonder Woman, noticing that one item, the Dreamstone, contains a Latin inscription claiming to grant the holder one wish. In 1984, Prince works at the Smithsonian Museum as an archaeologist while moonlighting as Wonder Woman, with her new co-worker, Barbara Ann Minerva, becoming envious of Diana. She spares Maru and redirects Ares' lightning into him, destroying him for good. Ares attempts to direct Prince's rage and grief at Trevor's death by convincing her to kill Maru, but the memories of her experiences with Trevor cause her to realize that humans have good within them. He entreats her to help him destroy mankind in order to restore paradise on Earth, but she refuses.

When Prince attempts to kill Ares with the "Godkiller" sword, he destroys it, telling Diana that, as the daughter of Zeus and Hippolyta, she herself is the "Godkiller". Morgan appears and reveals himself as Ares. She kills him, but is confused and disillusioned when his death does not stop the war. Prince confronts and fights Ludendorff, who bolsters his own strength by consuming an elixir procured by Maru. Horrified by the result of the gas, Prince blames Trevor for letting it happen as a result of letting Ludendorff live. Ludendorff then fires the new gas at the battle lines from an artillery gun to the castle houses. She meets Ludendorff, whom she assumes to be the mortal disguise of Ares and plans to kill him before Steve intervenes and prevents her from doing so, fearful that their covers would be blown and result in their deaths too. She also enters the castle after incapacitating an aristocratic German woman and stealing her gown as a disguise. The following morning, Prince ignores Trevor's advice to remain with Charlie and Napi and scout out the surrounding area. The team briefly celebrates, taking a photograph in the village, where Prince and Trevor fall in love. As the group approaches the trenches, Prince, unwilling to see the civilians suffer, charges into no man's land and liberates the nearby village of Veld with the aid of the group and Allied forces. Diana adopts the surname "Prince" to fit in better at Trevor's suggestion. Although forbidden by his commander to act, Trevor, with secret funding from Morgan, recruits Moroccan spy Sameer, Scottish marksman Charlie, and Native American smuggler Chief Napi to help prevent the gas from being released. Diana translates Maru's notes, revealing that the Germans plan to release the deadly gas at the Western Front. Trevor and Diana deliver Maru's notebook to the Supreme War Council, where Patrick Morgan is trying to negotiate an armistice with Germany. She helps Diana acquire some contemporary clothing so she can better fit in and retain her anonymity. The two arrive in London and Diana is introduced to Etta Candy, Trevor's secretary. She releases Trevor and immediately leaves Themyscira with him to find and destroy Ares. Believing Ares is responsible for the war, Diana arms herself with the "Godkiller" sword, a shield, lasso and her suit of armor and sets out on her own, in defiance of her mother, to stop Ares and end the war. He stole a notebook with valuable information from the Spanish chief chemist Isabel Maru, who is attempting to engineer a deadlier form of mustard gas under the orders of General Erich Ludendorff. Interrogated with the Lasso of Hestia, Trevor reveals that World War I is raging in the outside world and that he is an Allied spy. The Amazons engage and kill all the German sailors, but Antiope dies intercepting a German bullet meant for Diana. The island is soon invaded by the landing party of a German cruiser pursuing Trevor. In 1918, Diana, now a young woman, rescues Captain Steve Trevor, a pilot with the American Expeditionary Forces, after his plane crashes off the coast of Themyscira. Further information: Wonder Woman (2017 film)
