User blog comment:X-Men Are Cool/Next Year's Crossover/@comment-32775454-20171201200406/@comment-27700324-20171203052922

Probably not. There are references to a whole bunch of comic book characters that won't appear. Plus Superman and Batman are blocked off due to appearing in the movies. They only got Superman for Season 2 of Supergirl because of Superman being dead at the time in movies.