The heroes of the Arrowverse team up with Batwoman in a brand-new poster for this year's "Elseworlds" crossover event. This will mark the third time the heroes have banded together, outside of guest appearances in each other's shows. They previously joined forces to halt an alien invasion and defeat fascist doppelgängers in 2016 and 2017, respectively. Although the Waverider crew from Legends of Tomorrow will not feature this year, opting instead for its own crossover, it promises to be their biggest and strangest collective outing yet.

Not only will "Elseworlds" feature the established stars of Arrow, The Flash, and Supergirl, it'll also mark the first appearance of Batwoman. This incarnation will be played by Ruby Rose, with the episodes serving as a back-door pilot for a standalone Batwoman series. As well as Kate Kane and her alter-ego, the superhero team-up will also see the debut of the Monitor and the return of Tyler Hoechlin's Superman, who fans will get to see don his iconic black suit. Details for the episode remain under wraps, though the official synopsis confirmed a Barry and Oliver body swap, whilst a recent teaser seemingly revealed destruction of Earth 90, the aptly named home of the 1990's Flash, Jay Garrick.

Related: Elseworlds is Destroying the Reality of the 1990 Flash TV Show

Unveiled on the official Twitter page for Supergirl, the new poster features the heroes facing down an unseen threat on a war-torn world. There is no sign of Garrick his time around, but Batwoman features front and center alongside the core trinity. Behind them, fans get glimpses of Felicity Smoak, the new Lois Lane, and both versions of Superman - seemingly confirming them as separate entities rather than one and the same. Given the multidimensional nature of the episodes, it remains unclear on which Earth the showdown is taking place. Regardless, the poster teases an epic scale of action and stakes.

Arrowverse Elseworlds Crossover Poster

Although the casting of Rose proved controversial to some, it was mostly met with a wave of praise. Excitement has only grown in recent weeks, following the release of behind the scenes photos and footage of the character in action. Though many will remain eager to see Batman himself show up, the fact that the history of Gotham will feature is a huge, exciting step forward for the show, especially if teases of The Joker pay off. As well as a comics-accurate costume, the arrival of the character also marks another step forward in the representation of LGBT characters and heroes.

Equally exciting is the fact that the poster continues this year's trend of leaving a full look at the villain just out of fans' reach. Although the teaser suggested that Monitor would play a more villainous role, the poster depicted him aligned with the heroes. While he may start off as an antagonist, he'll clearly switch sides or define himself as having heroic intentions at some stage.

Instead, the role of the main villain will go to Jeremy Davies. Considered as crazy as his patients at Arkham Asylum, Davies will play Dr. John Deegan. Given that no reference to a Dr. Deegan exists in the realm of DC, and the fact he feels too small scale to be a threat to the multiverse, the character has been the subject of much speculation. While Arkham is known for its deranged doctors - including Jonathan Crane and Hugo Strange - the idea of Doctor Destiny sounds more plausible, especially given the reversal of destinies experienced by Oliver and Barry. Whatever the case, however, the poster will no doubt leave fans even more excited to see Batwoman join the heroes in dealing with and punching the threat head-on.

More: Elseworlds: 7 Possible Reasons For Superman's Black Suit (And 3 Unlikely Ones)

Arrowverse's "Elseworlds" event begins with The Flash on Sunday, December 9 at 8 pm ET, continues with Arrow on Monday at 8 pm ET and concludes with Supergirl on Tuesday at 8 pm ET.

Source: The CW