One still-persisting question about DC’s Titans for their streaming service is whether or not the show exists in the same world as the “Arrowverse” of series including Arrow, The Flash, DC’s Legends of Tomorrow, and Supergirl.

We’ve even wondered, ourselves, if Kid Flash (Keiynan Lonsdale) might be speeding over to the show.

On the bright side, it would add a cohesion to the DC world of TV; on the other, it would create some limitations; for example, Slade Wilson a.k.a. Deathstroke would have to be the very busy Manu Bennett.

At the recent ACE Comic Con, a fan asked Arrow Executive Producer Marc Guggenheim if we will be seeing a crossover… and here’s what he said:

“Great question, again, above my pay grade. I will say this, the one thing I’ve learned is ‘never say never.’ I could not begin to tell you how often we say to each other, ‘We never thought any of this was going to happen. We never thought we’d see all these characters. We never thought there’d be a universe.’ So, never say never, but in terms of which characters be on which shows, what’s part of the universe, above my pay grade and probably that’s a good thing.”

Titans is coming to the DC streaming service in 2018.