There's a lot to forward to when in Season 4 of "Arrow," including the introduction of Damien Darhk and a possible collaboration between the Green Arrow and Green Lantern.

During an interview with TVLine, executive producer Marc Guggenheim revealed that the season's new big bad, Damien Darhk, will be introduced in the Season 4 premiere.

"He's very different from our previous Big Bads in that he's not hiding in the shadows," said the showrunner. "But at the same time, he doesn't have a public persona."

That, however, won't keep him from showing up and showing out at a VIP event that Captain Lance will attend.

"He shows up at a very public meeting that Lance is present at. If Darhk wants to show up somewhere, he's certainly going to!"

The EP also tweeted a piece of concept art for Season 4 of the CW series advertising Coast City, which is the home of the Green Lantern Hal Jordan in comics. This could be a hint of a collaboration between the emerald hero and the Green Arrow.

The image, which is a billboard that shows Coast City as a seaside oasis, includes a quote pulled from the Green Lantern's oath. 

"In brightest day, in blackest night, come to Coast City when money's tight," it reads.

This is not the first time that the show made a reference to Green Lantern. In fact, both  "Arrow" and "The Flash" have made multiple references to Coast City and Ferris Air, which is the aviation company where Jordan works.

Guggenheim also revealed that Oliver will embrace his new identity right from the start of Season 4.

"He can't be the Arrow anymore, because everyone believes that Roy Harper was the Arrow, and Roy Harper is dead, at least as far as everyone believes," the EP told Green Arrow TV. "So, he had to adopt a new identity. All of this is explained in the season premiere; we come straight out with it."

"Arrow" Season 4 debuts Oct. 7.