A fan recorded the QnA, which you can watch below.
Here are some excerpts, which looks to include a potential spoiler as Amell seemingly confirms The Lazarus Pit.
It would be cool to crossover with Supergirl because it's something with Greg Berlanti who is 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 the show, so that would be really interesting.
Gotham would be a tough one, just beacuse 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.
It would be interesting to cross over with Constantine, only because he knows a lot about the Lazarus Pit, which isÂ something that we've introduced in the show this year.
Amell also talks fighting Ra's al Ghul and its affect on Oliver and more in the video below.
Arrow airs Wednesdays at 8pm ET on the CW.