• The Flash and Supergirl will crossover in an episode of "Supergirl" on March 2016.

The Flash and Supergirl will crossover in an episode of "Supergirl" on March 2016. (Photo : Facebook/The Flash)

"The Flash," "Arrow," "Legends of Tomorrow" and "Supergirl" will have a crossover episode very soon.

While talking to the cast members, executive producer Greg Berlanti confirmed that he already saw the episode and everyone's chemistry seems palpable. "There's a lot of camaraderie and there's a real sense of family amongst them when you watch it," he said.

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Meanwhile, Gustin shared that the episode entitled, "Invasion" will feature some intense fight scenes between the characters. However, the actor stressed that it's just very normal because there are tons of superheroes in the installment. As of Caity Lotz also shared that Sara would seem intimated by Supergirl (Melissa Benoist). "She's so used to being the bad chick, and then this girl comes in and can levitate and she's like, 'Alright I can see you,'" she said.

In other news, "Arrow" lead star Stephen Amell admitted that his character, Oliver Queen, would be quite smitten at the sight of Supergirl. "Oliver is a bit standoffish with Supergirl which probably means that he's smitten." Last month, executive producer Andrew Kreisberg explained why Oliver keeps his distance from Supergirl.

"Part of Oliver's journey in these episodes is, he's kind of hit his breaking point with things he's willing to accept. He's had Mirakuru soldiers and the Lazarus Pit and magic with Damien Darhk, but flying aliens who can incinerate you with their eyes is beyond the pale for him. So he sort of keeps his distance, which is a very Oliver thing to do," he said. As of Supergirl, Benoist said that her character simply wants to be part of the group.

The crossover episode will see the superheroes beating the alien race Dominators together.

"Arrow," "Supergirl," "The Flash" and "Legends of Tomorrow" crossover will take place in the next couple of weeks.