When Oliver realizes that Felicity, Thea and Donna are trapped in Palmer Tech with everyone else, he looks to a surprising ally to help Team Arrow save the day.

But will Oliver ever truly be able to leave behind his past as the Arrow, and, if so, what becomes of the team he has worked so hard to assemble Will Diggle, Thea, and Laurel be left to continue Olivers crusade without him And with Malcolm Merlyn having ascended to the top of the League of Assassins as the new Ras al Ghul, is anyone really safe 1.

The city has been attacked by Ghosts, assassins led by a dangerous man named Damien Darhk.

However, when Oliver returns, Diggle makes it very clear that he doesnt want Oliver on the team.

Meanwhile, Thea begins to exhibit effects from the Lazarus Pit.

In addition, Felicity is faced with a tough business decision and looks to one of her employees, Curtis Holt, for help.

Meanwhile, Laurel talks Thea into returning to Nanda Parbat to ask her father to put Sara into the Lazarus Pit.

Meanwhile, Oliver asks Captain Lance for a favor and while hes not surprised at the response, he is surprised at what he finds out next.

Felicitys guilt over not finding Ray sooner causes tension between her and Oliver.

Meanwhile, Sara joins Laurel, Thea and the team on a rescue mission for Ray.

However, the effects of the Lazarus Pit take over and threaten to jeopardize the entire operation.

Thea s bloodlust returns and she loses control in front of Alex.

Malcolm arranges a meeting between Vandal, Green Arrow and The Flash that doesnt go as planned.

Meanwhile, Felicity, Thea, Diggle and Laurel work with Team Flash to come up with a weapon powerful enough to destroy Vandal Savage.

Things take a horrible turn when Damien Darhk retaliates in a brutal manner at Olivers mayoral holiday party.

Seeking revenge, Oliver goes on a brutal manhunt looking for Dahrk.

Meanwhile, Nyssa makes her move and Roy Harper returns to Star City.

Meanwhile, Thea continues to battle the blood lust, Malcolm steps in to help his daughter, and Laurel has a heart to heart talk with Nyssa.

With HIVEs next attack imminent, Lance wonders if Donna is safer without him in her life.

Meanwhile, with the wedding fast approaching, Oliver begins to feel guilty that he hasnt told Felicity about his son.

Using her magical ability to summon animal powers, Vixen gets a lock on Darhks location and the team goes to war.

The team learns shes killing couples on their wedding day so Oliver and Felicity decide to pose as bait.

Felicity Season 4 Episode Guide