The Flash: Everything You Need to Know Before S3

This Year's CW Crossover Will Be Bigger Than Ever

With "Supergirl" joining "Arrow," "The Flash" and "DC's Legends of Tomorrow" on the network next season -- all shows under the purview of executive producer Greg Berlanti -- the time is ripe for a massive crossover of all four shows, and Amell predicts that the superhero team-up will air across one single week as a four-night extravaganza.

"I think what we'll end up seeing is one giant four-night crossover. This is kind of an unprecedented moment in terms of the history of network television. To have four shows [with the] same showrunner," he explained, referring to Berlanti.

Berlanti himself also weighed in on the crossover and teased what would bring the characters of these shows together. "I'm going to probably try to have one unifying threat, as opposed to different things on different ones, which is what the first year was," he revealed, adding that they're just starting the process of writing the crossover event.

"It's an external threat from outside the shows that will involve Supergirl coming over to 'The Flash,' then 'Arrow' then 'Legends of Tomorrow,'" executive producer Marc Guggenheim explained. What that threat might be, however, he did not disclose.

However, Amell draws the line at a musical crossover: "No. I'm out! I’m the first one. I get to draw the line, and I draw the line at musical."

Starring Grant Gustin, Jesse L. Martin, Carlos Valdes and more, "The Flash" returns to The CW on October 4 at 8 pm EST.

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