Malcolm Merlyn

Malcolm Merlyn is the main turned secondary main antagonist in the CW's superhero TV series Arrow; he was the main antagonist of Season 1, the anti-villain/senary antagonist in Season 2, and the main, later secondary antagonist turned anti-hero in Season 3. He is the father of the late Tommy Merlyn, and Thea Queen, Oliver's best friend and sister, a close associate of Queen's father Robert and mother Moira as well as his primary nemesis. He is the brain behind the Undertaking and the current leader of the League of Assassins. He is based on the character of Merlyn the Archer from the comics.

Malcolm is portrayed by John Barrowman.