We’re still a couple of weeks away from the big four-show crossover with DC’s superhero shows on the CW.  It’s been fun seeing things weave in and out between the shows over the last couple of seasons.  And now we’re looking to go to another Earth for another story entirely.  Here’s the second promo:

But it’s the third, most recent, trailer that tells more of the tale.

If nothing else, the title font for the storyline is a nod to DC’s original Crisis.  And beyond that, there’s that current DC buzzword: Doomsday.  On so many levels, that clock is running out.