The CW’s “Arrow” has cast “Falling Skies” alum Ryan Robbins in a recurring role for season four, Variety has learned exclusively.

Robbins will play Conklin, a sadistic and ruthless member of Shadowspire who will be an adversary for Oliver (Stephen Amell) in the flashback sequences. The show’s flashback arc will also see the titular hero take on Jimmy Akingbola’s Baron Reiter (aka Baron Blitzkrieg in DC Comics Canon), who is the leader of Shadowspire.

Robbins will make his first appearance in episode three of season four. The actor is one of several new additions for the superhero show’s fourth year; he’ll join Echo Kellum as Curtis Holt (aka the heroic Mr. Terrific), Neal McDonough as villain Damien Darhk and “Star Trek: Voyager” favorite Jeri Ryan as Jessica Danforth, a friend of the Queen family with political ambitions.

In addition to “Falling Skies,” Robbins has appeared on shows including “The Killing,” “Hell on Wheels” and “Ascension.” On the big screen, the Canadian actor recently filmed “The Shack,” and John Travolta’s “Life on the Line,” and will next be seen in Legendary’s “Warcraft” and “Spectral.” He’s repped by Sanders Armstrong Caserta Management and Play Management.

“Arrow” season four premieres Wednesday, October 7 at 8 p.m. on The CW.