In the comics, the Dark Archer is the Green Arrow's archenemy. He was born Arthur King, and his alias is Malcolm Merlyn. He was a business man who owned the Merlyn Global Group, and he was a friend of the Queen Family. However, when his wife was killed by an unknown assailant, it destroyed his faith in humanity. He joined the League of Assassins, led by Ra's al Ghul, and ultimately became the Dark Archer. Vortigen is Smallville's incarnation of the same character.
Malcolm Merlyn (The Dark Archer) was not only the archenemy of the Green Arrow (The Emerald Archer) here, but also in the CWs Arrow.
Lois tells Oliver she had an arrow close to her heart and she didn't think it was cupid. Cupid was in fact another archer in the DC Universe associated with Green Arrow.
Steve Bacic plays The Dark Archer archenemy to The Green Arrow, he also played Drug Dealer Sean Sonus in CWs Arrow.
Steve Bacic previously guest stared on Smallville season 1 Pilot episode as the Garage Worker.