I’m sure I’m not the first one to say this, but Man of Steel 2 has a pretty crowded canvas. In addition to the full-fledged introduction of Batman, we also have the introduction of Wonder Woman and Cyborg to the cast. Many people see this as rushed attempt to get a [Justice League](movie:401267) movie into production, which can end up being true. However, there are a few things that can be done to give all of the characters a proper build-up without stuffing all of their stories into one film. Since Jeremy Irons recently said that the script is not finished, I hope the story will go in this direction.
The first step would be to introduce Wonder Woman as her alias: Diana Prince (Note: in the original comics, she was allowed to use a WWII nurse’s identity to lead a double life, but that detail will not likely be included - at least in this film). Telling Wonder Woman’s entire backstory in addition to Batman’s would just come across as overkill. Introducing Wonder Woman as Diana Prince without spending too much time on her story, however, seems like a fine solution.
Perhaps she could be a LexCorp employee unaware of what evils Lex Luthor is up to. As she watches the conflicts of Batman and Superman unfold in the film, she can be more and more tempted to spring into action as Wonder Woman. Midway through the movie, they can introduce her invisible jet as a project that LexCorp is working on. Then, during the final battle, Lex will be dismayed to discover that she has stolen it to aid Batman and Superman. Again, we don’t want her to overstay her welcome, so she can do a quick flyby in the invisible jet and maybe launch a missile or two. Or if they really want to introduce her, her golden lasso can come out of nowhere and take Lex to the ground before she runs off into the shadows.
Introducing Wonder Woman this way will give the audience a chance to get to know her character without overcrowding the film with another superhero. Since it is a small role, it won’t take away too much screen time from Batman or Superman.
As for Cyborg/Victor Stone, his introduction could fit in perfectly too. In 2011, DC relaunched its Justice League series as The New 52 with Cyborg as one of the founding members. In this series, Victor Stone is a high school football player whose body is destroyed by radiation from the Mother Box (an object that has a backstory too big for one film) before undergoing an experiment that makes him half-man, half-robot (see below). Considering that the first scene shot for Man of Steel 2 was a football game, it is likely that this scene will introduce Victor Stone.
So here’s my idea of how his character can be done: Victor Stone will be introduced during the football scene as a star athlete. The Daily Planet could be covering the game when something like a storm suddenly hits the stadium. Clark Kent then becomes Superman and rescues everyone in attendance except Stone, who could be crushed under a scoreboard. Since the Mother Box will not likely be used, it could be revealed that Lex Luthor used Stone’s body as one of his experiments. Like the Winter Soldier in [Captain America: The Winter Soldier](movie:254973), Lex Luthor could program Cyborg into attacking Superman and Batman. This could likely be the final battle of the movie, as Lex Luthor has no superpowers or strength of his own. Of course, he will turn good at the end and join Batman, Superman and Wonder Woman in the Justice League. Since Ray Fisher was cast after the scene was filmed, this will likely require additional filming to make this storyline possible.
This is all just a personal suggestion, but I think that if the script ends up going in this direction, Man of Steel 2 can successfully introduce both Wonder Woman and Cyborg while still having the movie focus on Batman and Superman. A lot of people are saying that Man of Steel 2 might as well be called Justice League with all of these characters,” but I think they may say differently if this route is taken.