Voiced by Vanessa Marshall. This movie is based on the Flashpoint event which was meant to be the reboot of the DC Universe. After the Barry Allen travels back in time to save his mother, he changes the whole timestream making everything different. Her role in this movie is that she has a war against Aquaman because she killed Mera and it made Aquaman angry, Amazons against Atlanteans. The Amazons has made London ''New Themyscira''. She defeats Aquaman at the end of the movie, but the rest of the world gets destroyed by Captain Atom's energy, Captain Atom was held as a last resort by Aquaman, and Flash manages to revert everything as it was right before the world got consumed.
In the following days, Diana soon uncovered Ares, who exposed her to be the God Killer, having been originally conceived to be the ultimate weapon against her brother. Following this revelation, a fierce battle ensued, where Diana fulfilled her purpose in freeing mankind from Ares' influence. The loss of Steve in World War I had left Diana sobered, but she vowed to protect humanity whenever she was needed, albeit in a cautious and distant way.
Princess Diana of Themyscira is an Amazonian warrior princess and one of the world's first superheroes, known as Wonder Woman. She is the daughter of Queen Hippolyta and Zeus, king of the Olympians. Born on Themyscira, Diana was raised in paradise, hearing tales of her the Amazons' great task of defeating the God of War, Ares, and bringing peace to the world, ushering in a new era of peace to the world. Upon coming of age, Diana began pursuing the life of a warrior, despite her mother's rejections. Determined to serve, she ultimately enticed her aunt Antiope to train her in secret, but was soon discovered by her mother, Queen Hippolyta. Begrudgingly, the queen accepted Diana as a warrior, and ordered Antiope to train her better than any other Amazon.

To defend himself against critics, Gaines, in 1940, hired Marston as a consultant. “‘Doc’ Marston has long been an advocate of the right type of comic magazines,” he explained. Marston held three degrees from Harvard, including a PhD in psychology. He led what he called “an experimental life.” He’d been a lawyer, a scientist and a professor. He is generally credited with inventing the lie detector test: He was obsessed with uncovering other people’s secrets. He’d been a consulting psychologist for Universal Pictures. He’d written screenplays, a novel and dozens of magazine articles. Gaines had read about Marston in an article in Family Circle magazine. In the summer of 1940, Olive Richard, a staff writer for the magazine, visited Marston at his house in Rye, New York, to ask him for his expert opinion about comics.

Diana sees Sir Patrick Morgan in the base, who reveals himself to be the true Ares, and tells her of his plan for a world without humanity by having them destroy each other. Ares proposes that Diana help him accomplish his vision of paradise, but Diana promptly refuses, not wanting to kill billions of innocents. Ares then reluctantly engages her in an epic battle while Steve and his comrades attempt to dismantle the plane harboring the mustard gas.
Writer Gerry Conway brought Steve Trevor back to life again in issue #271 (September 1980).[16] Following Diana's renunciation of her role as Wonder Woman, a version of Steve Trevor from an undisclosed portion of the Multiverse accidentally made the transition to Earth-One. With Diana's memory erased by the Mists of Nepenthe, the new Steve again crash-landed and arrived at Paradise Island. After reclaiming the title of Wonder Woman, Diana returned to Military Intelligence, working with Trevor and re-joined by supporting characters Etta Candy and General Darnell.[9]
Due to the reboot of the character following Crisis on Infinite Earths, numerous things no longer made sense in terms of continuity as it related to the remainder of the DC Universe. As her first overall appearance was now in continuity around the Legends miniseries, it no longer made sense that she was a founding member of the Justice League of America. This founding position was instead given retroactively to Black Canary. Later it was decided that she should be given this position back and thus both she and Black Canary were considered founding members of the Justice League. In reference to the Justice League though, although she has more than 400 combined appearances therein, she has had most of her character development in her own series.
Perhaps due to her Amazonian background, Diana greatly respects other noble selfless warriors, as evidenced when she attended Superman's funeral in Smallville and spoke of how he had been much more than a soldier (adding to what Batman said about Metropolis burying an empty casket). As a result of her great posthumous respect, she was, therefore, more than willing to aid Batman in honoring the heroic death of Superman, by helping round up the metahumans from Lex Luthor's files to form a team of superheroes (later known as the Justice League) to protect the world from the imminent mysterious alien invader Steppenwolf and his Parademon minions after Superman's death left the world vulnerable.
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