It's official: Batwoman begins this December. The CW has announced the dates and times for this year's three-show Arrowverse crossover. It will begin in The Flash on Sunday, December 9 at 8 pm ET, continue in Arrow on Monday, December 10 at 8 pm ET and then conclude in Supergirl on Tuesday, December 11 at 8 pm ET.

RELATED: Is Arrow’s Stephen Amell Teasing a Ruby Rose/Batwoman Costume Test?

As played by John Wick: Chapter 2 star Ruby Rose, Batwoman will make her Arrowverse debut in this year's crossover. This version of Batwoman, Kate Kane, was introduced in 2006 as a socialite who dons a cape and cowl to fight crime in Gotham City. The logline for the character describes her as “an out lesbian and highly trained street fighter primed to snuff out the failing city’s criminal resurgence. But don’t call her a hero yet: in a city desperate for a savior, Kate must overcome her own demons before embracing the call to be Gotham’s symbol of hope.” The hope is for the character to spin off into her own solo series.

Unlike last year, 2018's Arrowverse crossover will not include DC's Legends of Tomorrow. Though the ensemble series will not take part in the yearly crossover in 2018, an earlier report speculates characters from the show could potentially make an appearance in the storyline.

RELATED: Stephen Amell Welcomes Batwoman’s Ruby Rose to the Arrowverse

The graphic announcing the dates appears similar to the one shown earlier this year at The CW’s Upfronts, though this announcement showcases Flash's new costume.

The CW’s Arrowverse shows will return this fall, with The Flash kicking things off on Tuesday, October 9 with its Season 5 premiere at 8 pm, followed by Season 2 of Black Lightning at 9 pm. Supergirl will follow the next week on Sunday, October 14 at 8 pm, with Arrow the next day on Monday, October 15 at 8 pm. Finally, DC’s Legends of Tomorrow will return on Monday, October 22 at 9 pm.