To find the perfect location to shoot the Amazon island of Themyscira, the birthplace of Wonder Woman herself, the film's producers searched all over the world, finally settling on the Cilentan Coast: a stretch of coastline on the Tyrrhenian Sea, located in the Province of Salerno in Southern Italy. It was chosen because most beaches in the world that sit below big cliffs disappear beneath the tide for part of every day. Production designer Aline Bonetto and her location manager Charles Somers considered 47 countries and visited several of them before they found what they were looking for. Bonetto explained that, "Italy had beautiful weather, a beautiful blue-green sea, not too much tide, not too much wave. Our effects team added some cliffs in post-production, and it was the perfect way to go". The estuary at Lower Halstow in Kent is featured in the scene in which Diana arrives at a Belgian creek to make her way to the warfront. Bill Westenhofer served as the visual effects supervisor for the film and Martin Walsh served as editor.
"Gas was intended to win the war. On that much Wonder Woman is absolutely right." said David Hambling in Popular Mechanics. Rachel Becker of The Verge stated that despite the scientific liberties of using a "hydrogen-based" chemical weapon as a plot device, the film succeeds in evoking real and horrifying history. "First off, mustard gas is such a horrible, terrifying weapon, it doesn't need to be made more potent. But if you were a chemist bent on raining destruction on the Allied forces, you wouldn't do it by replacing the sulfur atom in mustard gas with a hydrogen atom. You'd know that sulfur is the linchpin holding together this poisonous molecule."
Diana is depicted as a masterful athlete, acrobat, fighter and strategist, trained and experienced in many ancient and modern forms of armed and unarmed combat, including exclusive Amazonian martial arts. With her godlike abilities of incalculable superhuman strength, nigh-invulnerability, speed, flight, healing factor and semi-immortality, Diana’s fighting prowess is enhanced. In some versions, her mother trained her, as Wonder Girl, for a future career as Wonder Woman. From the beginning, she is portrayed as highly skilled in using her Amazon bracelets to stop bullets and in wielding her golden lasso. Batman once called her the "best melee fighter in the world". The modern version of the character is known to use lethal force when she deems it necessary. In the New 52 continuity, her superior combat skills are the result of her Amazon training, as well as receiving further training from Ares, the God of War, himself, since as early as her childhood. The Golden Age Wonder Woman also had knowledge in psychology, as did her Amazon sisters.
Upon arriving, Diana and Hermes found themselves under attack by Hades' minions. Though they fought them off, they were surprised to find that time for Zola had passed much more quickly than for them. Her pregnancy was nearly at the end of its term. When they attempted to leave with her, Hades appeared, warning that one of them must stay behind - and if Diana was unprepared to make Hera his wife as promised - she would do. However, upon Eros' pistols, he instead agreed to let them all go in exchange for them. When Diana's back was turned, he fired them at her, and she fell under love's spell to him.
"Honestly... I think we're gonna be dead way before that. And you know what? I don't mind. It's an honorable end. But we've gotta shut Steppenwolf down. Superman's a no-show. You've got no powers, no offense. This guy might be working for the enemy. We don't now. You're tripping over your feet, and mine... whuf, you're gorgeous, and fierce... and strong. I know we went to war with the Amazons, but that was before my time. You know what? I don't wanna die. I'm young. There's shit that I wanna do. I just feel like... I didn't really embrace the sea or the land. I've been a loner my whole life. But being part of something bigger, like this... maybe I'm scared because... I'm meant to..."
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.
As early as the 1950s, Wonder Woman's tiara has also been used as a razor-edged throwing weapon, returning to her like a boomerang. The tiara allows Wonder Woman to be invulnerable from telepathic attacks, as well as allowing her to telepathically contact people such as the Amazons back on Themyscira using the power of the red star ruby in its center.
The next day, Diana awoke to find that they'd hitched a ride on a larger ship and arrived in London. She was less than pleased at the sight of the city, stating that it was hideous. As they walked through the streets of London, Diana insisted that Trevor take her to the war. She was dismayed to hear that he intended to deliver Doctor Poison's notebook to his superiors in the British War Council. Trevor promised that if he went with her to deliver the notebook, he would take her to the war. Though annoyed by the detour, Diana agreed. Trevor then realized that she was only wearing her battle armor, and took her to a store to buy her some clothes. As they walked to the store, Diana was delighted to see a baby and ran toward it, with Trevor having to pull her away.
The "Year One" storyline retells Diana's origin growing up on Themyscira. She lives an idyllic life and harbors interest for the outside world, and the first connection to it comes in the form of Steve Trevor, who crashes on the island and is the sole survivor. A contest is held to determine which Amazon is the best candidate to take Steve home, with Diana volunteering despite knowing the cost to leave the island is to never return. Diana wins the contest and departs with Steve. Once arriving in America, Diana is taken into custody by the government to discern her origins. She meets Etta Candy and Barbara Ann Minerva along the way. While incarcerated Diana is visited by the gods in animal form and bestow upon her powers of strength, speed, agility, durability, and flight. She discovers Ares, the god of war, is working to destroy humanity. Accepting her new role in Man's World, Diana, with the help of the gods in animal form, subdues Ares with the lasso. Now called Wonder Woman, Diana becomes one of the world's greatest heroes.
Various Wonder Woman enemies would debut in the comic series. Issue #1 introduced Wonder Woman's nemesis, Ares, as the embodiment of all abnormal emotions, evil, and essentially all that Wonder Woman was against. Issue #5, the character of Doctor Psycho, a murderous psychopath with an intense hatred of women, was debuted, Issue #6 introduced Cheetah while issue #9 introduced Giganta. Also Issue #9 debuted Queen Clea, which would later help form the female supervillain team, Villainy Inc.. Later on Issue #49 debuted another recurring enemy, Circe.
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.