User blog comment:Artemis C./SuperGirl/@comment-34954086-20120923110258/@comment-1038387-20120923171523

Source:

"Wildstorm was NOT available when we began. I'd be interested in incorporating some of those characters if we got a third season. But so far, I've only included one - and only in a stealth way, that not even the company noticed."

So it can be season one, or two, we could've already had it and completely missed it.