Trivia / Kingdom Come

  • Actor Allusion: In a one-panel cameo, The Joker looks just like Jack Nicholson in the Tim Burton Batman movie. This is a general rule for all Alex Ross publications that feature The Joker. Likewise, Alex Ross clearly looked up what Frank Gorshin looked like as an old man in order to draw The Riddler.
  • What Could Have Been...: The original concept, which would have been revealed in the sequel The Kingdom, was that the Kingdom Come universe was actually a revitalized Earth-Two that somehow survived the Crisis, but was later rejected on the fact the Earth-One and Post-Crisis characters wouldn't exist in Earth-Two. If it's true, then they changed their minds so late that they couldn't completely remove that plot thread from the story as The Kingdom is bookended with Superman of Earth-Two pounding on the walls of reality.
    • Kingdom Come and The Kingdom both show a great deal of similarity to Twilight of the Superheroes, an idea Alan Moore proposed back in 1987.