"Arrow" season four trailers revealed a new villain lurking in Star City, and his name is Damien Darhk, a character played by Neal McDonough.

Not only in "Arrow" will he spread chaos. ComicBook.com exclusively learned that Darhk will also make an appearance in "The Flash" and "Legends of Tomorrow," although, there weren't many details given on how his story will sync with the current "Arrow" plot.

"You go back to the League — I did an episode of Legends last week — and I look exactly the same in 1975 but you see he's not as confident and doesn't have such an agenda forty years ago as he does now," McDonough shared.

"So it's fun to play the different times, you know?" he added. "Going back in time with Legends, and The Flash, with The Flash, I'm just this crazy, fun, enjoy everything while I kill everybody type of character."

Within the context of CW's "Arrow," Darhk was revealed as one of Ra's al Ghul's horsemen. According to Inverse, Darhk was set to be killed after he lost the competition, but managed to escape together with some followers.

Other than his skills — Darhk used to be a member of the League of the Assassins, so he's pretty much skilful in hand-to-hand and weapon combat — he also has magic powers. It was described as something that can manipulate primal energy to drain a life force, and at the same time, he reportedly has telekinesis.

Many fans are excited on how the "Arrow," "The Flash" and the "Legends of Tomorrow" universe are going to intersect, since there have been a few crossover instances that happened between the worlds of Oliver Queen, played by Stephen Amell, and Barry Allen, played by Grant Gustin.

Although there no further details were revealed yet, at least, the audience now knew that Damien Darhk will be the link between them, as per We Got This Covered.

"The Flash" airs Tuesdays, and "Arrow" airs Wednesdays, both at 8 p.m. ET, while DC's "Legends of Tomorrow" is expected to premiere in January.