A four hour long Justice League (hopefully) well done? Give it to me!
It's supposed to be pretty close to it. Most of the stuff that was revealed in that teaser was not in the movie, so this is a very encouraging sign.
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The one thing that DC always had going for them is that their villains are superior to what Marvel can put out there. The Joker last year was proof positive of that. Now, we will have Black Adam. Although he will probably be some sort of Anti Hero in this universe.
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Justice Society is supposed to be introduced in his movie, as well.