<P> In season four, after retiring from vigilantism, Oliver has live a happy life with Felicity Smoak at Ivy Town, until Thea and Laurel approach him, telling that they need him back at the newly rechristened Star City, which has been taken over by "Ghosts". He eventually discovers that the mastermind is H.I.V.E.'s leader Damien Darhk (Neal McDonough), and become enemies with Darhk as both himself and his vigilante alter - ego . As the "Arrow" persona has been tarnished, Oliver now goes by the codename "Green Arrow" as he becomes a vigilante once again, but as a symbol of hope for the city, gradually regaining Diggle's trust . Oliver also decides to run for mayor of Star City . During this time, Oliver discovers that he is the biological father to a nine - year child named William (Jack Moore), with Samantha Clayton (Anna Hopkins), a college classmate whom Oliver had a one - night stand during his relationship with Laurel . This discovery complicates his relationship with Felicity and his duty as Green Arrow, as well as threatens to jeopardize his mayoral campaign . After subsequent attacks from Darhk leaving Felicity permanently paraplegic, his son being kidnapped and Laurel is killed, leading Oliver to take his opportunity to kill Darhk when it arises, while his team helps avert Darhk's plans for a nuclear holocaust . Season four flashbacks focus on Oliver returning to Lian Yu on Amanda Waller's orders to infiltrate the mysterious Shadowspire organization . </P> <P> In season five, Oliver recruits a team of vigilantes to help balanced his double life as Green Arrow and Star City's mayor . He is also stalked by a mysterious archer, Prometheus (Josh Segarra), who has some troublesome link to his past . Later Oliver figures out that Prometheus is someone close to him . Oliver also facing with the possibility that his life might have inadvertently affected by his best friend and ally Barry Allen's time - travelling actions . The season's flashbacks explores Oliver time in Russia, where he joins the Bratva as part of an assassination ploy against Konstantin Kovar and exploring the criminal fraternity in the process . There, he meets and being trained by one of Ra's al Ghul's daughters, Talia al Ghul (Lexa Doig), as a hooded archer, before eventually returning to Lian Yu and subsequently Starling City . </P> <P> In season six, after a series of battles with Prometheus led to Samantha's death, Oliver struggles to raise William himself and tries to have a relationship with his son . After he and Felicity rekindled their romance, they eventually married at Central City with Barry Allen and Iris West . Oliver also develops a feud with hacktivist Cayden James and his cabal, and also discovers Ricardo Diaz is manipulating them to against each other before battling Oliver himself after killing James . </P> <P> Amell has appeared as Oliver Queen in each season of all four Arrowverse shows, (Arrow, The Flash, Legends of Tomorrow and Vixen), one of only two characters to do so, as well as appearing in the Supergirl portion of the crossover events . </P>

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