Thanks for these, everyone - this is a great help. It's also gratifying to see just how many crossovers we actually have and using such a wide and diverse range of other mediums.
Labrat - Could you define the difference between "Crossover" and "Guest Star"? Batman sometimes makes what I call a "Guest Star" appearance in my stories, but as he's not a main character, I don't think we can count them as a "Crossover".
Crossovers generally have characters from all mediums represented/interacting fairly strongly. If Batman isn't a main character, but only mentioned as an aside or as a footnote, then it probably wouldn't be classed as a crossver, no. But it would really depend on how strong a presence he has within the story.
LabRat
