Remember the ol' Fight Club trailer the CW did with all their then-superhero shows last year or so? Well they made a new one!
It's The CW's Fight Club 2.0, now featuring Supergirl and even an appearance of the Martian Manhunter himself!
This is starting to look like comics brought to life more and more! Let's add the JSA to the mix! (Which they will, this year, on Legends')