This season released villain turned anti-hero, Black Siren who's Laurel Lance's Earth-two counterpart. She would go on to be a special visitor character during the fifth season of Arrow​ and a series standard in the sixth season and seventh season in addition to making a Specific visual appeal during the eighth season.Beginning with the 2nd

This season launched villain turned anti-hero, Black Siren who is Laurel Lance's Earth-two counterpart. She would go on to get a special guest character within the fifth season of Arrow​ along with a series regular during the sixth season and seventh season Together with earning a Exclusive appearance from the eighth season.Laurel mentioned