Marc Singer has been cast to appear as General Matthew Shrieve, and he’ll make his first appearance in episode 14, ‘The Return’ (which we seemingly managed to miss when Marc Guggenheim tweeted it out). ComicBookResources (please note that there are major spoilers for the midseason finale on CBR so we recommend you don’t click it) first reported the story and you can read what they say below.
CBR has learned that actor Marc Singer has joined the show’s cast as a character from DC Comics history — he’ll play General Matthew Shrieve, a character created by writer J. M. DeMatteis and artist Pat Broderick, first seen in 1980’s “Weird War Tales” #93. Singer’s role is slated to be recurring following his debut in the 14th episode of the currently unfolding third season of “Arrow,” which will likely air in late February or early March.
Here’s the official character description from Warner Bros. TV: “In the DC Comics, Matthew Shrieve is the leader of a group known as the Creature Commandos. In ‘Arrow’ he will play a significant role in the latter portion of the season’s flashback storyline.”