Moira Queen (Susanna Thompson)Ruthless and calculating, Moira Queen (Susanna Thompson) is the mother of Oliver and Thea and the widow of the late Robert Queen. She is the matriarch of the Queen family. After Roberts death, she married Walter Steele, who now is the Chief Executive Officer of her late husband's company Queen Consolidated.When Oliver returns home after being presumed dead for five years, Moira hires John Diggle to be her sons bodyguard. To the outside world, Moira is loving and dedicated mother. However, Moira is not what she seems. She is the one who had her son abducted after her returned home.Moira believes the ends justify the means and, because of this, often makes decisions that put her and her loved ones in grave danger. No one knows Moiras true motivations for her actions.