Laurel dies in a fight with Damien, and Oliver discovers his plan to detonate nuclear weapons and rule the Earth's remains. Oliver's life as a vigilante and with Felicity are complicated by his mayoral run and the discovery of the existence of his son, William (Jack Moore). soldier Thea works with Oliver as 'Speedy', but with a violent temper Laurel attempts to resurrect Sara using the Lazarus Pit and Curtis Holt ( Echo Kellum) aids Felicity and the team. John discovers his brother Andy ( Eugene Byrd) is alive and a H.I.V.E. Oliver resumes vigilantism under the new moniker of ' Green Arrow'. In the fourth season, Oliver and Felicity try and start a new life in Ivy Town, but return to the city, now renamed Star City, when a terrorist group known as H.I.V.E., headed by the mystically enhanced Damien Darhk ( Neal McDonough), is attacking the city. The series follows billionaire playboy Oliver Queen ( Stephen Amell), who claimed to have spent five years shipwrecked on Lian Yu, a mysterious island in the North China Sea, before returning home to Starling City (later renamed 'Star City') to fight crime and corruption as a secret vigilante whose weapon of choice is a bow and arrow. Stephen Amell stars as Oliver Queen, with principal cast members Katie Cassidy as Laurel Lance, David Ramsey as John Diggle, Willa Holland as Thea Queen, Emily Bett Rickards as Felicity Smoak, John Barrowman as Malcolm Merlyn and Paul Blackthorne as Quentin Lance also returning from previous seasons.

The showrunners for this season were Marc Guggenheim and Wendy Mericle. The series is based on the DC Comics character Green Arrow, a costumed crime-fighter created by Mort Weisinger and George Papp, and is set in the Arrowverse, sharing continuity with other Arrowverse television series. The fourth season of the American television series Arrow premiered on The CW on October 7, 2015, and concluded on May 25, 2016, with a total of 23 episodes.

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