The Arrow/Flash crossover episodes turned out to be a great success for both shows with Arrow reportedly achieving an all time series-high rating. During a recent interview, actor Stephen Amell (who plays Arrow/Oliver Queen) spoke about treating fans to more such crossovers.
Reportedly, Amell is open to the prospect of Arrow appearing on other DC Comics based shows like Gotham (Fox) or Constantine (NBC).
"I know the logistics are challenging and the politics are above my pay grade, but in the interest of putting the best product forth for the fans, I don't think we should limit ourselves to 'Flash' and 'Arrow' crossing over because we're both on the CW," Amell told USA Today earlier this week. "If you're owned by Warner Bros., or if you're just in the DC Universe, everything should be in play."
While an Arrow/Gotham or Arrow/Constantine crossover might not be an immediate possibility due to business reasons (the shows are on different networks), fans can expect an Arrow and Supergirl crossover in the near future (provided the in-development Supergirl series gets a go-ahead from the network).
Flash and Arrow co-showrunner Greg Berlanti is developing the Supergirl TV series for CBS. A crossover between CBS and the CW seems more likely to occur since the former network owns 50% of the latter one, reports ComicBookResources.