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Legal Reasons May Prevent "Flash" And "Supergirl" From Crossing Over

Ever since "Supergirl" was first announced, the question of whether or not the CBS superhero show would ever cross over with her CW counterparts "Arrow" and "The Flash" has weighed heavily on fans. Early comments from executive producer Greg Berlanti way back in November of 2014 said Kara Zor-El could have the potential to "enter the worlds of Arrow and The Flash."

But that was an old line of thought, one that even predates Melissa Benoist's casting as Supergirl. Things have changed since then, and executive producer Andrew Kreisberg recently told The Hollywood Reporter that there are actually legal roadblocks standing in the way of Supergirl and Flash or Arrow crossing paths.

"There's always those late nights, delirious, semi-high on pizza where you're like, 'You know what would be really cool? If ...,' " said Kreisberg. "But right now there is no legitimate actual plan to bring ['The Flash's'] Cisco [Carlos Valdes] onto 'Supergirl' or to bring ['Supergirl's'] Winn [Jeremy Jordan] onto 'Legends [of Tomorrow].' First of all, we don't even know if we could, legally. And quite frankly, just making the 'Arrow'-verse which is what we call 'Legends,' 'Flash' and 'Arrow' work and then making 'Supergirl' work, it's enough of a challenge without having to add a fourth player."

While the talk of legality is new, this comment echoes what Berlanti said last week following a screening of this week's "Flash"/"Arrow" two-part crossover. At the time, Berlanti answered the CBS/CW crossover question by saying that they hadn't planned for one, "only because we just received the [full season] pick up. Not at this point."

"Supergirl" airs on Mondays on CBS; "The Flash" and "Arrow" air on Tuesdays and Wednesdays, respectively, on the CW.

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