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.
Gloria Steinem, editor for Ms. magazine and a major supporter of Wonder Woman, stated "... [Marston] had invented Wonder Woman as a heroine for little girls, and also as a conscious alternative to the violence of comic books for boys." Badower described a near-international incident (involving an unnamed Russian general rolling dozens of tanks and munitions through a shady mountain pass) as an outstanding example for standing up to bullies. "She ends up deflecting a bullet back and disarming the general," he says, adding that "she doesn't actually do anything violent in the story. I just think that Wonder Woman is smarter than that."
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.
As Hippolyta was still a clay statue, Diana was forced to take the Amazon throne, at least until she could find a way to turn her mother back to normal. At the same time, the Justice League had discovered strange environmental events that had destroyed small villages around the world, leaving only vegetation behind. Furious, Wonder Woman attacked Swamp Thing, accusing him of causing such devastation, while Swamp Thing claimed innocence. Aquaman defused the situation before it could escalate any further. Later, Wonder Woman returned to Themyscira, only to discover Hippolyta's statue had crumbled. On a training session, Clark asked Diana if she wanted to talk about her recent experiences, but Diana replied that, as queen, grief is not a luxury she could afford. Later, Diana was called for a meeting by the Amazon council, which forced a choice on her: become permanent Queen or abdicate the throne. Before the discussion could continue, the island was attacked by Stymphalian Birds, Ares’ pets who were now drawn to Diana as the God of War. Accepting her new responsibilities, Diana successfully defended Themyscira.
Steve Trevor's secretary who befriends Diana. Describing her character, Davis said, "She's a woman in a man's world and so being heard and seen aren't the easiest things, but it kind of doesn't deter her", adding, "Etta is unapologetically herself and I think that that's the thing that has drawn me to her the most". When asked if she was previously familiar with the character, Davis responded, "No. I wasn't. It took me a while to know that I was auditioning for Etta because even when I found out it was Wonder Woman, I still had no idea what the role was. It took a little while then I Googled the character". On Etta Candy's relationship with Steve Trevor, Davis said, "One of the great things that Etta gets to work with Steve Trevor is because Steve is not your typical man, in that he does entrust her with things that in 1918 probably wouldn't have been entrusted to a secretary of somebody who is quite important", further explaining, "So I think that [Trevor] needs her just as much as she needs that because now she's been given responsibility that she wouldn't have normally be given before, and equally he has somebody who could probably fly under the radar a bit. So he can trust the person who no one's really looking at".
Although she initially forbids Diana to be trained as a warrior, Hippolyta reluctantly agrees to let General Antiope, Hippolyta's sister and Diana's aunt, train her, only more rigorously than any other warrior. In 1918, Diana, now a young woman, rescues US pilot Captain Steve Trevor when his plane crashes off the Themysciran coast. The island is soon invaded by German soldiers that had been pursuing Trevor. The Amazons kill the crew, but Antiope sacrifices herself to save Diana. Steve is interrogated with the Lasso of Hestia and reveals that a great war is consuming the outside world and that he is an Allied spy. He has stolen a notebook of the chief chemist Dr. Isabel Maru, who is attempting to engineer a deadlier form of mustard gas under the orders of General Erich Ludendorff from a weapon facility in the Ottoman Empire. Believing Ares to be responsible for the war, Diana arms herself with the "Godkiller" sword, the lasso, and armor before leaving Themyscira with Steve to locate and stop Ares for good.
Meanwhile, the New God Orion had learned that a great danger was to be found on Earth in the form of the child of a god. He sought out his old friend Milan for help. Nearby, Diana and Lennox decided to seek Milan by themselves, leaving Zola and Hera to bicker with one another in the meantime. They found him in the old subway system with Orion. Though their encounter began violently, Lennox managed to explain that they had accounted for six of the seven children of Zeus. Orion believed that one of those seven was the child that he had been sent to kill. Lennox and Diana concluded that he was referring to Zola's kidnapped son, and so they convinced Milan to search through the ether until he located the boy in the arms of Demeter. When they all returned to Manhattan to find Zola and Hera in a bar with War, Diana managed to convince her uncle to lead her to Demeter's domain.
After Darkseid and Grail's retreat, they returned to a base in the Amazon Rainforest, where Darkseid was setting his mysterious plans into motion. He tasked his loyal Female Furies with tracking down a godly relic he needed, but they were unable to do so thanks to the intervention of Steve Trevor and his A.R.G.U.S. forces. Meanwhile, Wonder Woman fought a number of villains that had been recruited by Veronica Cale: Zara of the Crimson Flame, Blue Snowman and Anglette. As Diana caught up with Steve at A.R.G.U.S. HQ, Jason returned wearing a suit of armor gifted to him by the gods, but with no knowledge of its purpose. As news came in of an attack by Grail, Wonder Woman and Jason immediately responded just in time to prevent Grail from killing another demigod. Wonder Woman bound Grail in the Lasso of Truth and forced her to reveal Darkseid's plans. Grail explained that Darkseid was looking to build himself an army of Amazons. Due to her half-Amazon blood, Grail was able to break free from the Lasso's grip and retreated.
Diana's treacherous paternal half-brother, based on the Greek mythological god of war, who masquerades as a speaker for peace on the Imperial War Cabinet as part of his deceptive master plan of conquest and destruction. Describing the Sir Patrick persona of his character, Thewlis said, "Sir Patrick's entire drive through the other half of the story is to bring about the armistice. That's his whole intention no matter what's going on. He meets Diana and see in her somebody who is sympathetic to his cause, quite vehemently so."
While Superman watched out for Zod, Diana visited the deserted Themyscira to speak to her mother, still a clay statue. In her absence, a demon from Tartarus had escaped from its prison and roamed free on the island. Wonder Woman destroyed the creature and sealed the gates to Tartarus with her lasso. Leaving the island, she received word from Batman that Superman was engaging Zod and Faora in battle. Reaching Superman’s side, Wonder Woman steadily overwhelmed Faora until Zod threatened Superman’s life. Wonder Woman was forced to let the criminals go.