The CW has announced when their annual Arrowverse crossover event will be taking place. This year's intersection of the network's DC superhero shows will include The Flash, Supergirl and Arrow, who are going to be introduced to Ruby Rose's Batwoman. Beyond that, precious few details in regards to what we can expect from the crossover have been made available. But we at least know when you can expect to see the action go down.

This year's event will take place in December, starting with an episode of The Flash on Sunday, December 9. That will be followed by Arrow on Monday, December 10 with Supergirl closing things out on Tuesday, December 11. All three of the episodes will air at 8 p.m. Those who really know their CW DC shows will probably be quick to notice that The Flash and Supergirl have swapped time slots for the event, which is indeed the case. The Flash typically airs on Tuesday with Supergirl anchoring the network's Sunday night lineup. For currently undisclosed reasons, the Arrowverse crossover will see those flip-flip. We're guessing it simply has to do with the chronology of the story being told. The Flash will cross the 100 episode mark prior to the events of the crossover.

Story details are virtually non-existent. What we know for sure is that DC's Legends of Tomorrow will not be present for this year's crossover. That could mean that they're trying to keep things slightly more grounded. Since we're being introduced to Batwoman and Gotham City, that would seem to make sense. How much of Gotham City we're going to see and how exactly that factors into the heroes teaming up this year remains to be seen. But the simple fact that Batwoman will finally introduce the iconic location to the Arrowverse is a reasonably big deal.

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It was initially announced during The CW's upfront presentation this year that Batwoman would be part of the Arrowverse crossover this year. At the time, they didn't clarify as to who would be playing the hero. It was revealed earlier this month that The Meg and Orange is the New Black star Ruby Rose is taking up the mantel. The event will serve as the character's first ever appearance in live-action. Batwoman has previously appeared in several DC animated shows and movies. Kate Kane, the alter ego of Batwoman, will also be portrayed as an out lesbian. Rose faced backlash online after her casting was announced, which caused the actress to depart social media for the time being.

The hope is that Batwoman's appearance in the crossover event will lead to Ruby Rose leading her own TV series centered on the Gotham City hero. Arrowverse architect Greg Berlanti is currently developing the series with Caroline Dries, known for her work on The Vampire Diaries. We'll be sure to keep you posted as more details on this year's crossover event are made available. You can also check out a poster for this year's event, as shared by Arrow star Stephen Amell on Twitter, for yourself below. This news comes to us courtesy of The CW.

Ryan Scott