Special Guest Stars Katie Cassidy as Laurel Lance John Barrowman as Malcolm Merlyn Katie Cassidy as Laurel Lance (Earth Two) / Black Siren Manu Bennett as Slade Wilson Guest Stars Katrina Law as Nyssa al Ghul Byron Mann as Yao Fei Gulong Madison McLaughlin as Evelyn Sharp Dolph Lundgren as Konstantin Kovar Co Starring Keri Adams as Bethany Snow Jack Moore as William Clayton Taras Kostyuk as Gennady Marc-Anthony Massiah as Agent Kosinski Ish Morris as A.R.G.U.S. Guard #1 AJ Crivello-Jones as A.R.G.U.S. Guard #2