On the basis of my many years of studying pop culture, I can say without fear of contradiction that this means that either Superman or Klaatu is coming to visit us.
We’re either going to get a lecture…
…or a hero.
Of course, there’s always the possibility that it’s just Crypto, returning to destroy all humans.
Either way, let’s be on our best behavior when they arrive. We don’t want Earth to get a bad reputation.