Kinda funny...spoiler alert
It's revealed at the end of the movie that Martian Manhunter was actually General/Defense Secretary Swanwick all along. So that would have him in appearing in Man of Steel and JL 1 and 2, the world was in peril in all of those movies so I'm thinking that angle was kinda far-fetched that he would just stay on the sidelines and not provide any sort of assistance to a planet he called home.
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