Because Barry Allen made such a strong impact on Arrow, there’s a lot of left-over business, especially between Barry and Felicity. So, we really wanted to deal with that, sooner rather than later. And then, when the idea for the bigger cross-over came up, it just felt like every one of these episodes is an event. That’s one of the things we learned over the course of two seasons of Arrow. There are no miss-able episodes. What can you do to make sure that everyone watches an episode? And sometimes that’s the guest star, or the big plot twist. With these first Arrow episodes, and these first Flash episodes, because of the benefit of working on both shows, there’s something amazing and something game-changing in every one of these episodes. And then, because Episode 9 will be the mid-season finale for both shows, and they’ll have their own reasons to tune in, Episode 8 felt like a great opportunity to bring the two shows together.
There really aren’t that many characters that we’ve asked (DC Comics) to use, that we haven’t gotten access to. Fortunately for us, with Arrow, we were able to bring on Deathstroke and The Huntress, and this year we have Katana. It was actually DC comics’ idea for us to use Ray Palmer/The Atom. On The Flash, with Geoff Johns, our partner, we’ve carved out this whole world of characters that we have access to. There are the big ones that fit into the Superman, Batman, Wonder Woman mythos, but since we’re not using those characters, they’re subsidiary characters don’t really feel necessary to us. We never feel like we’re confined. We’re more impressed that we get to play with as many characters as we do. By the end of this season, on both shows, we’ll have Green Arrow, Black Canary, Katana, The Atom, Firestorm and The Flash. We’ve got a pretty good chunk of the Justice League, on both shows. We never look at ourselves as limited. We just look at ourselves as blessed that we get to play with as many of these characters as we do. You always want your lead to be the coolest character on the show. If you’ve got Green Arrow and The Flash, why would you want Batman and Superman around? I think we’ve figured out how to do those characters really well. There’s something very distancing about Superman and Batman that I think works so well in the features, but that I’m not sure would necessarily lend themselves to a weekly series. We’re very happy with the characters that we have.