Don has a visitor from his past. Stan embarrasses a superior. Peggy helps Ginsberg with a problem. Harry finds that he has a new ally at the agency.
Deathstroke hits Oliver at home. Oliver, Canary, 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 the team return to the lair and find Slade waiting for them. An epic battle breaks out and Oliver is faced with a choice - his battle with Slade or his family.
When Frank Bertinelli (guest star JEFFREY NORDLING) is arrested, Oliver knows it's only a matter of time before his daughter, Helena, aka The Huntress (guest star JESSICA DE GOUW), returns to town. To make matters worse, Laurel is picked to try Frank's case, putting her right in the path of Helena. Oliver tells Sara he will handle his ex-girlfriend, but when Helena takes hostages at the courthouse, including Laurel, the Canary will stop at nothing to save her sister. When The Huntress and Canary meet, an epic battle begins. Meanwhile, Roy realizes he needs to keep Thea safe, but doesn't like the way he is forced to go about it.
When Frank Bertinelli is arrested, it's only a matter of time before his daughter, The Huntress, returns. When she takes hostages including Laurel, Sara (aka Canary) takes action.
Following Slade's return and his promise to make good on his threat to destroy Oliver's loved ones, Oliver focuses all his energy on preparing for battle with his former friend. Sara tries to help but, fearing for her safety, Oliver pushes her away. Meanwhile, Diggle is recruited by Amanda Waller and A.R.G.U.S. to stop a warlord (guest star Lee Majdoub) he knew from his time in Afghanistan. Always the solider, Diggle agrees to help. However, he's not prepared when Amanda introduces him to the rest of the team – Deadshot, Bronze Tiger and Shrapnel, all criminals he and Arrow helped put away. Lyla defends the team and explains the world is a complicated place, but Diggle isn't sure he agrees. When the mission takes a dangerous turn, Diggle is forced to make a difficult decision.
Amanda Waller recruits Diggle for the Suicide Squad - including Deadshot, Bronze Tiger (MICHAEL JAI WHITE) and Shrapnel (SEAN MAHER) - but Diggle's not so sure.
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