Oliver rallies his team as Slade’s soldiers attack the city. Felicity gets a call from S.T.A.R. Labs with game-changing news and Thea comes face-to-face with her father — Malcolm Merlyn.

Adrian Holmes, Caity Lotz, Chelah Horsdal, Cynthia Addai-Robinson, David Nykl, John Barrowman, Kevin Alejandro, Roark Critchlow, Summer Glau