WATCH: "Arrow" Promo Reveals Damien Dahrk's Powers

Even though Executive Producer Marc Guggenheim promised "Arrow" fans that the show will take on a lighter tone in Season 4, this new trailer's title promises Star City will remain as gritty as when it was known as Starling City.

Titled "Embrace Your Dark Side," the teaser offers a look at the power wielded by the show's latest evil mastermind Damian Dahrk (Neal McDonough), and the levels to which Oliver Queen will go to protect his best friend and partner in crimefighting, Diggle.

Starring Stephen Amell, Emily Bett Rickards and David Ramsey, "Arrow" Season 4 debuts Wednesday, Oct. 7 at 8 pm EST on The CW.

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