Summary: MALCOLM MERLYN RETURNS — Oliver (Stephen Amell) rallies his team as Slade’s (Manu Bennett) soldiers attack the city. Felicity (Emily Bett Rickards) gets a call from S.T.A.R. Labs with game-changing news and Thea (Willa Holland) comes face-to-face with her father – Malcolm Merlyn (guest star John Barrowman).
