After a violent shipwreck, billionaire playboy Oliver Queen (series star Stephen Amell) was missing and presumed dead for five years before being discovered alive on a remote island in the North China Sea. Oliver returned home to Star City, bent on righting the wrongs of his family and fighting injustice. As the Green Arrow, he protects his city with the help of former soldier John Diggle (series star David Ramsey), computer science expert Felicity Smoak (series star Emily Bett Rickards), his vigilante-trained sister Thea Queen (series star Willa Holland), former police captain Quentin Lance (series star Paul Blackthorne) and brilliant inventor Curtis Holt (new series regular Echo Kellum).
Newly appointed Mayor Oliver Queen finds himself challenged as he fights on two fronts for the future of Star City. With Diggle back in the military and Thea adamant about hanging up her hood as Speedy, Team Arrow is down to just Oliver and Felicity—but they're no longer the only vigilantes in town. The Green Arrow's public defeat of Damien Darhk (guest star Neal McDonough) at the end of Season Four has inspired a new crop of masked heroes to step up and defend the city, though their painful inexperience makes them obstacles, rather than allies, in the field. The arrival of a deadly new adversary will force Oliver to confront questions about his own legacy, both as mayor and as the Green Arrow.