Crossover episodes between its hit superhero shows — “The Flash” and “Arrow” — have fueled the CW’s success, and network president Mark Pedowitz promises there will be more to come. “We’ll be doing them as special events in the fourth quarter,” he told ad buyers at the CW’s upfront presentation.

With yet more characters from the DC Comics universe entering the CW schedule with the pickup of “DC’s Legends of Tomorrow,” the plan is for even more creative storytelling, especially since the shows will all be in the hands of executive producer Greg Berlanti and his team, including EPs Marc Guggenheim and Andrew Kreisberg.

“We do have crossovers planned,” says DC chief content officer Geoff Johns. “The point of building these three shows out on the CW network is we can make a comicbook world. That’s really the secret formula starting to emerge on television for the first time.”

Johns says the plan is for the characters to weave in and out of storylines, in order to help and challenge one another. “The shows are acting like monthly comicbooks by doing so,” he notes.

Indeed, Stephen Amell’s “Arrow” and Grant Gustin’s “The Flash” appear prominently in the trailer for “Legends of Tomorrow.”

But there’s another DC character being introduced to the smallscreen this fall who might have to sit out all the crossover fun — at least for now.

Of CBS’ hotly anticipated “Supergirl,” “The network has said publicly at this point they’re going to keep her to themselves,” says Berlanti. “I always approach the shows as a fan first, so I would love to see (a crossover). I think in success, all things are possible. But there’s a lot that would have to happen before everybody might say yes to that.”