|"The Man Under the Hood"|
|Original airdate||April 16, 2014|
|Written by|| Story by:|
|Directed by||Jesse Warn|
|Guest stars|| Caity Lotz as Sara Lance/The Canary|
Summer Glau as Isabel Rochev
Carlos Valdes as Cisco Ramon
Dylan Neal as Anthony Ivo
Chelah Horsdal as Kate Spencer
Danielle Panabaker as Caitlin Snow
|Followed by||"Seeing Red"|
Oliver, Sara, Diggle and Felicity return to the lair and find Slade waiting for them. An epic battle breaks out and one member of Team Arrow is sent to the hospital. Thea hits her breaking point, but just as Oliver is about to reach her, Slade intervenes and Oliver is faced with a choice – his battle with Slade or his family. Meanwhile, Laurel struggles with a new secret.
Oliver and his team break into the Applied Sciences division of Queen Consolidated and destroy the lab so that Slade does not have access to it to mass-produce the Mirakuru. In response, Slade attacks the team at their hideout and steals the "Skeleton Key", so that he can access any lab to get the equipment he needs. The team is too late and Slade successfully steals a bio-transfuser that will allow him to transfer his Mirakuru-infused blood to the convicts he freed. Oliver tracks Slade and discovers that he has kidnapped Roy and is using him to transfuse the blood. Oliver rescues Roy, and Isabel is mortally wounded in the battle. Later, Oliver reveals there is a cure for the Mirakuru, and Felicity goes to S.T.A.R. Labs to have an antidote created. Meanwhile, Laurel investigates Oliver being the Arrow, which leads her to discover that Sara is the Canary. Laurel stops her investigation when her father tells her that the Arrow's identity is irrelevant to the symbol that he represents. Laurel later blackmails her supervisor into releasing and reinstating her father. Slade's army of Mirakuru warriors gather and Slade uses his own blood to heal and empower Isabel as well. In flashbacks, Oliver kills Ivo at his request, in exchange for telling him and Sara about the Mirakuru cure.
Preparation ran from February 12 until February 20, 2014. Shooting ran from February 21 until March 4, 2014.
|"City of Heroes" • "Identity" • "Broken Dolls" • "Crucible" • "League of Assassins" • "Keep Your Enemies Closer" • "State v. Queen" • "The Scientist" • "Three Ghosts" • "Blast Radius" • "Blind Spot" • "Tremors" • "Heir to the Demon" • "Time of Death" • "The Promise" • "Suicide Squad" • "Birds of Prey" • "Deathstroke" • "The Man Under the Hood" • "Seeing Red" • "City of Blood" • "Streets of Fire" • "Unthinkable"|