Oliver asks Detective McKenna Hall out on a date. Meanwhile, a pair of nimble-fingered criminals make their presence known.

Officer Lance's past catches up with him when a killer he put away years earlier escapes from prison. Oliver comes to terms with some difficult news.

Oliver, Diggle, and Felicity learn that a sting operation is underway to capture Deadshot alive after he takes down a US Ambassador and six others overseas.

Felicity and Diggle head to Lian Yu Island to look for Oliver. Isabel Rochev plans a hostile takeover of Queen Consolidated.

A wounded Oliver reaches out to someone unexpected for help, and suffers flashbacks of a daring escape attempt on the island.

Diggle and Oliver learn that Deadshot is alive and well, and the troubled assassin has set his sights on Malcolm.

Felicity feels left out when Oliver makes Sara a part of the team, a brilliant thief known as the Clock King arms himself with technology that can open bank vaults, and Laurel refuses to attend a party for Sara.

Oliver is stunned when he discovers that Slade is in Starling City; back on the island, Sara and Oliver form a plan to deal with Slade's growing Mirakuru-induced rage.

Oliver learns that a man is transporting illegal guns into the Glades, Felicity shares astonishing information with Oliver, and Donner asks Laurel out.

Lance and Oliver try to talk Sara into reuniting with Laurel, who continues to spiral and Dinah is kidnapped.

Central City police scientist Barry Allan investigates a seemingly impossible robbery, while Sin turns to Roy for help when a friend goes missing.

Oliver and Diggle race to stop the Dark Archer before he puts his devastating plan into action.

Oliver expects the Huntress to return once her father is arrested. Meanwhile, Laurel is involved in a hostage situation at the courthouse and Roy tries to keep Thea safe.

Oliver is reunited with the count after a vertigo-related death at the nightclub. Meanwhile, Tommy finds himself in a very tight spot.

Oliver and the Canary are attacked by a trained killer, while Moira is presented with a difficult choice as the case against her ramps up.

Moira fights for her life in court, while Oliver tries to get to the bottom of a mysterious illness sweeping through the city.

Oliver tries to stop a man from setting off a bomb at a rally but gets trapped in the process, while Thea witnesses Roy's superstrength and demands answers.

With his nightclub set to open and a new romance brewing with McKenna, Oliver is as happy as he's been since returning to Starling City. That is until his ex suddenly shows up in town.

An angry resident of the Glades embarks on a kidnapping and killing spree to punish those he believes have wronged the residents of his neighbourhood.

Oliver prepares for battle with his former friend Slade. Amanda recruits Diggle to stop a warlord, but he is surprised when he meets the rest of the team she has assembled.