The CW has announced that the 2017-2018 television season’s Arrowverse crossover event will take place over two nights at the Television Critics Association summer press tour.

The crossover event beings Monday, November 27 on Supergirl, followed by a special Monday episode of Arrow. The crossover continues Tuesday, November 28 on The Flash, then concludes on that night’s DC’s Legends of Tomorrow.

CW boss Mark Pedowitz said that with The Flash and Legends already paired up on Tuesdays — and after discussions with producers and the marketing department — “We felt that it would be better and tighter in storytelling…. This was the best way to go.”

“Next year we may go back to four nights,” he allowed.

Pedowitz also made clear that unlike last year’s event, which technically started but barely took place on Supergirl, “It’s a full, four-episode crossover.” As for how one tops an alien invasion as a premise for the all-star team-up, all he would say is, “Romance is in the air.”

The Arrowverse’s very first crossover took place in December 2014 and started on The Flash and concluded on Arrow. In December 2015, Legends of Tomorrow villain Vandal Savage targeted Central City barista Kendra Saunders, triggering the involvement of Flash and Arrow heroes. Last year’s four-show, three-night event included Supergirl, as the many Superfriends battled the alien race known as The Dominators.