Stephen Amell talks "city-swapping" crossover event of Arrow and The Flash

New developments have emerged for the awaited crossover event of The Flash and Arrow this year.

Here's the latest from Arrow's main man, Stephen Amell:

Most of the Flash episode takes place in Star City, and most of the Arrow episode takes place in Central City. We have a common villain [in Vandal], which was not the case last year. And, just in general, we’ve done an excellent job of weaving not just two shows, but three shows together. 

BONUS SPOILER | More superheroes to gather in one scene:

We shot a scene… that had, like, nine superheroes in it. Nine people with either powers or supersuits. It was an amazing thing to look out over the scene and see the world that has been built over the course of three-plus years.

Source: TV Line