Two new behind-the-scenes videos about "The Flash" and "Arrow" reveal how the Hawks, Gorilla Grodd and King Shark were created as well as how one-shot fights are filmed.

"We actually thought about Gorilla City quite a bit, just to plant little things in there that could be shown in future episodes, like a Colosseum where possibly you may see a fight between gorillas eventually," teased special effects supervisor Armen Kevorkian. "The one thing you really don't notice is the gorilla army that's standing in the courtyard, and they're tapping their staffs. It's so far away and so small that all the effort that went in to do that... you don't really see it, but they're there."

As to "Arrow's" extended fight scenes, director and stunt coordinator James Bamford explained, "Many of the shots I have planned today are oners, meaning one camera, one shot from beginning to end. There's no cut in or out of this piece. It's one ballet of death, if you will."

Starring Grant Gustin, Carlos Valdes and Jesse L. Martin, "The Flash" airs Tuesdays at 8 pm EST on The CW. Starring Stephen Amell, David Ramsey and Emily Bett Rickards, "Arrow" airs Wednesdays at 8 pm EST on The CW.