Shortly after the team assembled, Wonder Woman assisted in helping a newly resurrected Superman regain his memories. With the team now fully assembled, Wonder Woman contributed to the successful offensive against Steppenwolf, forcing the alien invasion into retreat. Afterwards, she began to plan for the Justice League's future alongside Bruce Wayne.
Gaines didn’t know any of this when he met Marston in 1940 or else he would never have hired him: He was looking to avoid controversy, not to court it. Marston and Wonder Woman were pivotal to the creation of what became DC Comics. (DC was short for Detective Comics, the comic book in which Batman debuted.) In 1940, Gaines decided to counter his critics by forming an editorial advisory board and appointing Marston to serve on it, and DC decided to stamp comic books in which Superman and Batman appeared with a logo, an assurance of quality, reading, “A DC Publication.” And, since “the comics’ worst offense was their blood-curdling masculinity,” Marston said, the best way to fend off critics would be to create a female superhero.
I remember when I read in the news that Wonder Woman had been cast and my heart sank ... I'm sure we wouldn't have made the same choice. And then I started paying attention to her, and watching her and looking at her and it was just unbelievable. Frankly, I think they did a better job than I could have because I don't know that I would have scoured the earth as hard to find her ... They were looking for all the same things I would have looked for—all the values that Wonder Woman stands for exuding from someone in an honest way, and boy did they find it ... She shares every quality with Wonder Woman and that's no joke. It's one of those rare things. You need someone who can appear to be Wonder Woman on screen ... Every once in a while, there's superhero casting that transcends, because that person is so authentic to the character that it becomes identified with them, like Lynda Carter or Christopher Reeve.
Using Bruce's equipment, Diana tries to track down Victor. Victor is aware of Bruce's interest in him; due to his connection to information and security systems, Victor hacks in the computers to send Diana a message. Diana suggests a meeting and when Victor asks why he should trust her, Diana tells him that she knew he was at the lake watching her and Bruce. If she meant to harm him, she would have done it then. Diana and Victor meet face to face, and he tells them that the invaders they are searching for are hiding in the dead zones. When Diana tries to convince him to join them, he flies off.
Wonder Woman and the other heroes were finally released from the Firestorm Matrix when Batman used the Lasso of Truth on Firestorm. Superman was still infected with the Kryptonite shard inside his nervous system, but Lex Luthor was able to extract it, saving Superman's life. Luthor also assembled a group of villains that defeated the Crime Syndicate. Later, at the Batcave, Wonder Woman and the Justice League talked about the enemy that destroyed the Crime Syndicate's world and came to the conclusion that Darkseid would return.