|Original airdate||January 15, 2014|
|Written by||Jake Coburn|
|Directed by||Rob Hardy|
|Guest stars||Kevin Alejandro as Sebastian Blood|
Caity Lotz as Sara Lance
Sean Maher as Mark Scheffer/Shrapnel
Dylan Bruce as Adam Donner
Jesse Hutch as Officer Daily
Ana Mercedes as Maya Resik
Dylan Neal as Anthony Ivo
|Preceded by||"Three Ghosts"|
|Followed by||"Blind Spot"|
Oliver must tackle a new threat to the city when bombs start to go off in Starling City. Felicity discovers the person setting them off is Mark Scheffer, a man who goes by the nickname Shrapnel. The Arrow discovers Shrapnel's next target is Sebastian Blood's "Unity Rally" and tries to talk the alderman out of hosting it, but he refuses. The Arrow sets off to stop the bombing, but Shrapnel tricks him and traps him in a bomb-laced antique store where he is unable to move without setting off the device. While Felicity helps Oliver, Diggle races to the plaza to find the bomb before it goes off. Meanwhile, Roy continues to hide his new strength from Thea but, after she witnesses his super strength in action at the rally, she demands answers. Laurel's suspicions about Sebastian grow stronger once she learns that he grew up with Cyrus Gold, the man who killed Quentin's partner. After Donner refuses to help her investigate, she turns to The Arrow for help.
- After the second bombing, when Officer Quentin Lance radios in, he gives his call-sign as "DC52"—an apparent reference to DC Comics' New 52 comics universe.
- The hospital where Sebastian Blood's mother, Maya Resik, is living, is named St. Walker's Hospital, a reference to the DC Comics character, Saint Walker.
- This is the first time Adam Donner has appeared who was last seen in State v. Queen and seems to have fully recovered from his Vertigo overdose.
- This episode revealed that Sebastian and Cyrus Gold had known each other years before the events of State v. Queen.
Preparation ran from October 11 until October 22, 2013. Shooting ran from October 23 until November 1, 2013.
|"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" • TBA • "Seeing Red" • TBA • TBA • TBA|