The series recently added Torchwood star John Barrowman as a mysterious acquaintance of the Queen family and Australian actress Jessica De Gouw as the Huntress. They join Amell and a central cast that includes Colin Donnell as Tommy Merlyn, Katie Cassidy (Supernatural, Melrose Place) as Laurel Lance, David Ramsey (Dexter) as John Diggle, Willa Holland (The O.C.) as Thea Queen, Susanna Thompson (Star Trek: Deep Space Nine) as Moira Queen and Paul Blackthorne (24) as Detective Quentin Lance.

Arrow premieres Wednesday, Oct. 10 at 8 p.m. ET/PT on The CW.