I picture something like this:
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Also, I think Starro could be suitable villain, as it can potentially compromise one or a few of the league members and pit them against innocent people/the rest of the league (giving us our WW vs Superman fight, etc). Perhaps they officially form the league at the end not only to show the world that they are keeping them safe from the forces out in the universe, but from each other as well. (and for Supes, perhaps at the end, Supes can give Bats kryptonite, the only thing that could stop him in case he ever turns rogue).
I also think you can tie Starro with Atlantis, who appear to be the main antagonists throughout. Have it revealed that Arthur is not controlling the giant kraken, but rather that the kraken is Starro, and that it is controlling him.
I like that idea that Starro would be hidden in the depths of the ocean! Was he there for a long time? Recently awoken by the Atlanteans or did he somehow avoid detection and just snuck in somehow? Anyway it could be a great start, Atlantis being the first nation? he invades.
Also I just want to see the rest of the league try to stand up to a possessed Superman! I would pay to see that! Imagine the trailer where Batman is trying to get Superman's attention. Bats is moving forward towards Supes while Supes has his back towards Bats. Bats: "Superman, we need to get a hold of the situation in Metropolis." No answer. Batman moves closer, his body language shows the urgency of the situation. "Superman we need to go! The situation is getting out of hand!" Batman reaches for Superman's shoulder "Clark! We need..." Superman turns and there's a Starro creature writhing on his face. Batman turns and starts running... A slightly altered Superman's voice calmly says " You have nowhere to hide from me!"
t:But the problem is I think the only ones capable of taking down Superman at this point is either Captain Marvel or Zatanna/John Constantine. Although that would be a great way to introduce Justice League Dark!

