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In an alternate reality, a version of the Justice League known as the Justice Lords discovers the League's world and plot to take it over.
Did You Know?
The Lord J'onn's alibi about dimensions collapsing on one another was actually the plot of a miniseries Crisis on Infinite Earths; the part heard in the background when Batman and J'onn talk amongst themselves is "Perhaps by combining our forces, we may be able to avert this crisis which threatens all the infinite earths and all the divergent time-streams," which was what was done in the story after all the universes merged into one. See more
What do you want?
Same as you, I imagine. Power, control; but I had to see the best this planet had to offer. I am not impressed.
References Batman Beyond