Diggle and Felicity return to the island to convince Oliver to return as the Arrow.

When a dangerous criminal from Lance's past (MICHAEL EKLUND) escapes from prison, Felicity offers herself up as bait so Arrow, Diggle and Lance can capture him...but plans go awry.

After an impossible break in at Queen Consolidated, CSI Barry Allen comes to Starling to help with the investigation, Sin asks Roy for help so Thea tags along.

When Laurel asks the Arrow to investigate Sebastian Blood, Oliver is unsure whether to believe her accusations. But when they get too close to the truth, Blood strikes back.

Lyla asks Diggle to go on a mission alongside the Suicide Squad, a team assembled by Amanda Waller to undertake high-risk missions, even though the team includes Diggle's nemesis, Deadshot, and Oliver's enemy, Bronze Tiger.

After taking a ride home from Slade, Thea becomes his prisoner. Can Oliver and his friends save her? Also, someone close to Oliver is working for Slade, since his return from the Island after Tommy's death.

The mirakuru sends Roy into a rage rampage across the city. Sara thinks that the only way to stop him is to kill him but Oliver thinks he can still save him. Meanwhile, Slade is continuing his plan to make Oliver pay.

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.

As Oliver's face off with Slade escalates, his resolve to the no-kill rule is tested. Especially as Slade targets the woman Oliver loves.