In the series premiere of The CW's Arrow this week, DC Comics fans got a very cool surprise in the form of a quickly-glimpsed mask seen on the island Oliver Queen (Stephen Amell) was trapped on.

As those steeped in DC history could tell you, that was indeed the mask of Deathstroke - the master assassin who has taken on plenty of DC heroes through the years. And in an upcoming episode, Deathstroke is coming to Starling City to pay Arrow a visit... and things get ugly.While he never donned his costume, a character based on Deathstroke, Slade Wilson, previously appeared on Smallville. But as you can see in IGN's exclusive photo below, Arrow is basing their version of the character very closely on his comic book incarnation - and, it's safe to guess, the deadly skill set that comes with it.You'll see more of Deathstroke (played by Jeffrey Robinson) in the fifth episode of Arrow, "Damaged," airing in November.