Who should be the villain in the first Justice League live action film? This is an origin film that needs to be different from the Avengers. So no invading Alien race like the Chitauri (I'm looking at you White Martians). No Darkseid because he's too similar to Thanos, who will be in Avengers 2.
You can only pick one major villain, but that villain can have an army of some sort.