Hey Zeus, just for point of reference could you give us a wee idea of what kinda crises the League has faced faced before?

Like in my Cs I mentioned that Aquaman joined with the other big seven to stop the Darkseid invasion, which I literally just lifted from the new 52 cause I was unsure of how our league first met, or even who was in it. Cause I'm inferring from the writing that no one on earth has seen Brainiac before, but has supes?