Klaus Markos is a fictional character portrayed by Adam Lolacher in the TV series Arrow.
They appear in 1 episodes out of a total of 170 aired
Episodes1
The Brave and the Bold
episode S3.E8 december 2014As Oliver, Arsenal, and Diggle pursue a killer named Digger Harkness, they encounter an ARGUS team; Oliver and the Flash team up to try and stop Harkness.