The CW previously set the dates for the annual Arrowverse crossover, with this year’s storyline heading to Gotham City, a place previously off-limits to The CW.
That said, Batman does exist in this world, and Oliver Queen called him out by name last season on Arrow.
Arrow will continue the story on Monday, December 10, before it all comes to an end in Supergirl on Tuesday, December 11.
The crossover will start with The Flash on Sunday, December 9.