<P> In season five, Thea now works as Oliver's mayoral chief - of - staff, and is adamant about retiring from being a vigilante after Oliver kills a number of Tobias Church's thugs . She hires Quentin as deputy mayor and helps him beat his alcoholism . However, while working to help her brother politically she makes some ruthless decisions, including ruining the career of Oliver's new love interest, reporter Susan Williams . Felicity is able to restore Susan's credibility, and Thea, realizing she has gone too far, resigns from her position soon afterward, despite Oliver asking her to stay . She occasionally resumes her vigilante role when needed . She is abducted by Adrian Chase and brought to Lian Yu with the others on the team, and was on the island when Chase sets off the massive explosions at the end of the final episode . </P> <P> In season six, Thea is in the hospital, still in a coma five months after being critically injured in the destruction of Lian Yu . She later recovered during Thanksgiving Day and is greeted by her family and friends, including William, whom she happily acknowledged and help raising her nephew with Oliver and Felicity . She is also again works as Oliver's chief - of - staff following her recovery . After reuniting with Roy, Thea learns that Malcolm named her as his successor as leader of the League of Assassins' splinter faction Thanatos Guild . She then went into hiding with Roy and Nyssa al Ghul, along with searching for the locations of three remaining Lazarus Pits . </P> <P> Moira Queen (portrayed by Susanna Thompson; Seasons 1 - 2) is the mother of Oliver and Thea, the former acting CEO of Queen Consolidated, mayoral candidate and wife of Robert Queen and later Walter Steele . She also had a brief affair with Malcolm Merlyn after his wife's death, which resulted in Thea's birth . She is based on the minor DC Comics character of the same name . </P> <P> In season one, Moira is involved in "The Undertaking", a criminal conspiracy orchestrated by Malcolm to destroy the Glades, with him forcing Moira to handle all interference and supply him with the resources needed . Her involvement causes her to keep many secrets from her family which, when revealed, causes Walter to divorce her and her kids to become distant . Moira eventually confesses her involvement and Malcolm's, which results in her arrest . </P>

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