Stephen Amell has teased a couple of "Arrow" season 3 spoilers during his panel at the Dallas Comic Con's Fan Days.

Comicbook.com reported that during the event, Stephen Amell confirmed the existence of the "Lazarus Pit" on "Arrow" and talked about "Arrow" being involved in a crossover with "Supergirl", "Gotham", "Constantine" and "The Flash":

"It would be interesting. I was saying this earlier. It would be interesting to cross over with Constantine, only because he knows a lot about the Lazarus Pit, which is something that we've introduced in the show this year. It would be cool to crossover with Supergirl because it's something with Greg Berlanti, who's the helmer and sort of the brain trust or the center of the brain trust of Arrow and The Flash and I know so many of the people that are involved in the production of that show so that would be really interesting. And Gotham would be a tough one, just because I think they're out in a different time but the crossover with The Flash was so much fun and did so well that I can't imagine a world -- a universe, no pun intended -- where that didn't happen and continue to happen all the time."

Meanwhile, Superhero Hype reported about the possibility and probability of "Arrow" crossing over with "The Flash" and "Supergirl":

"CW President Mark Pedowitz confirmed at this year's TCA that the "Arrow" and "The Flash" crossover will become a yearly event for the two shows, and given the shared ownership of The CW between CBS and W,B a crossover with 'Supergirl' isn't out of the realm of possibility." according to Superhero Hype.

With so many new shows based on the DC Universe, it is tempting to think of a crossovers. Will DC dominate the TV realm as rival Marvel did with the movies?