An American pilot and the love interest of Diana. On his role for the film, Pine said, "I am an American pilot who's a spy. It's like a boy's dream: You're either a spy or a fighter pilot. The first thing I wanted to be was a fighter pilot a long time ago. I wanted to be Goose [from Top Gun]". As to how his mortal character would interact with an Amazon, Pine stated, "When I first read the script, it had elements of Romancing the Stone, kind of a very classic fish out of water. Two people that don't really bond well at first and they're butting heads and just fun, witty banter". When speaking about meeting the director and being cast, Pine said, "Patty is a pretty incredible human being. When we first met about the part of Steve, she sat across from me and essentially acted out the entire film over the course of a two-hour lunch. She was so specific, so articulate, and so ardent. I would've said yes just for Patty alone." Pine went through a workout regimen for the film, commenting, "I got in incredible shape for this film" but also joking "I was also wearing about 75 pounds of clothing. What I realized is that I made a major mistake, I got in great shape and they just put clothes over all my hard work."
After taking Despero to the authorities, Wonder Woman and Superman came across the mysterious Pandora, someone Wonder Woman was familiar with. She believed Superman could use her box to trap the evil she unleashed in ancient times; but when Superman touched it, he was overwhelmed by its power. While Pandora took the box and left, the two heroes received news that a new superhuman, Shazam, was entering the borders of Kahndaq. Their confrontation with Shazam turned violent until the rest of the Justice League and the Justice League of America intervened to defuse the situation. Suddenly, Dr. Light lost control of his powers and began absorbing Superman's solar energy, unleashing an energy beam at Wonder Woman. In a fit of anger, Superman killed Dr. Light with his heat vision, an action that caused a fight between the two Leagues.