Season 4 Episodes
01: Green Arrow
Oliver and Felicity’s blissful getaway is cut short when Thea and Laurel pay them a visit and tell Oliver they need his help back in Star City. The city has been attacked by “Ghosts,” assassins led by a dangerous man named Damien Darhk (guest star Neil McDonough). However, when Oliver returns, Diggle makes it very clear that he doesn’t want Oliver on the team.
02: The Candidate
When an old family friend, Jessica Danforth (guest star Jeri Ryan), tells Oliver and Thea that she is going to run for mayor, both Queens are concerned considering the last three mayors have been murdered. Despite their protests, Jessica makes her announcement; so the Green Arrow and Speedy vow to protect her. 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 (guest star Echo Kellum), for help.
The growing tension between Oliver and Diggle puts both their lives at risk when they go after Damien Darhk (guest star Neal McDonough) and a H.I.V.E. deployed meta-human. Meanwhile, Laurel talks Thea into returning to Nanda Parbat to ask her father to put Sara (guest star Caity Lotz) into the Lazarus Pit. However, Laurel is surprised when Nyssa (guest star Katrina Law) refuses to do it.
04: Beyond Redemption
Laurel must deal with the repercussions of taking Sara (guest star Caity Lotz) to Nanda Parbat. Meanwhile, Oliver asks Captain Lance for a favor; and while he’s not surprised at the response, he is surprised at what he finds out next.
When things take a turn for the worse with Sara (guest star Caity Lotz), Oliver calls in a favor from an old friend who deals in the mystical, John Constantine (guest star Matt Ryan).
06: Lost Souls
Felicity is frantic when she learns that Ray (guest star Brandon Routh) is alive and being held by Damien Darhk (guest star Neal McDonough). Felicity’s guilt over not finding Ray sooner causes tension between her and Oliver. Meanwhile, Sara (guest star Caity Lotz) 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. Donna Smoak (guest star Charlotte Ross) returns to Star City.
Team Green Arrow’s ongoing battle with Damien Darhk is complicated by a shocking revelation. Thea’s bloodlust returns and she loses control in front of Alex (guest star Parker Young).
08: Legends of Yesterday
Oliver and Barry Allen (guest star Grant Gustin) take Kendra Saunders (guest star Ciara Renée) and Carter Hall (guest star Falk Henstchel) to a remote location to keep them hidden from Vandal Savage (guest star Casper Crump) while they figure out how to defeat him. Malcolm arranges a meeting between Vandal, Green Arrow and The Flash that doesn’t 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.
09: Dark Waters
After the city is attacked again, Oliver makes a bold move against HIVE. Malcolm checks in on Thea and leaves her with a warning. Things take a horrible turn when Damien Darhk (guest star Neal McDonough) retaliates in a brutal manner at Oliver’s mayoral holiday party.
10: Blood Debts
Oliver must deal with the devastating consequences of Darhk’s (guest star Neal McDonough) last attack. Seeking revenge, Oliver goes on a brutal manhunt looking for Dahrk.
Diggle must learn to trust his brother Andy (guest star Eugene Byrd) when an enemy of their wartime past, an agent of the criminal organization Shadowspire, pays a visit to Star City. However, Diggle learns more than he bargained for about their shared time at war. Meanwhile, Oliver has to learn a whole new way of life.
The team faces off against a formidable villain nicknamed The Calculator (guest star Tom Amandes). Meanwhile, Nyssa (guest star Katrina Law) makes her move, and Roy Harper (guest star Colton Haynes) returns to Star City.
13: Sins of the Father
Oliver receives an offer from Nyssa (guest star Katrina Law) that is hard to refuse. 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.
Oliver realizes he needs help battling Darhk (guest star Neal McDonough), so he calls in an old friend—Vixen (guest star Megalyn E.K.). Using her magical ability to summon animal powers, Vixen gets a lock on Darhk’s location and the team goes to war. Meanwhile, Thea has a heart-to-heart talk with Malcolm.
16: Broken Hearts
A heartbroken Cupid (guest star Amy Gumenick) returns to Star City with one goal—to destroy anyone in love. The team learns she’s killing couples on their wedding day so Oliver and Felicity decide to pose as bait.
17: Beacon of Hope
Brie Larvan (guest star Emily Kinney) breaks out of jail and turns up at Palmer Tech threatening to kill everyone unless she gets the bio-chip that is implanted in Felicity’s spine. When Oliver realizes that Felicity, Thea and Donna (guest star Charlotte Ross) are trapped in Palmer Tech with everyone else, he looks to a surprising ally to help Team Arrow save the day.
Oliver and Diggle learn that Merlyn is going to try to break Darhk (guest star Neal McDonough) out of prison. Meanwhile, Laurel gets a surprising offer and Felicity has a heart-to-heart talk with Curtis (guest star Echo Kellum).
19: Canary Cry
Oliver and the team struggle to come to terms with Laurel’s death, especially Diggle who is overwhelmed with guilt for choosing to believe Andy (guest star Eugene Byrd) had changed. Meanwhile, Lance refuses to believe his daughter is really gone and asks Nyssa (guest star Katrina Law) to help bring her back. A recent Black Canary sighting in Star City only seems to prove his theory that Laurel isn’t actually dead.
As Oliver and Felicity look for a magical solution to defeat Darhk (guest star Neal McDonough), a vengeance-driven Diggle gets a lead on Andy’s (guest star Eugene Byrd) whereabouts and heads off to confront his brother. Meanwhile, Alex (guest star Parker Young) takes Thea on a vacation that quickly turns into a nightmare.
21: Monument Point
When Team Arrow learns what Damien Darhk’s (guest star Neal McDonough) next move is, Felicity realizes she needs to ask her father, Noah Kuttler (guest star Tom Amandes), for help. Noah and Oliver have a heart to heart talk that leaves Oliver rattled.
22: Lost in the Flood
Following the shocking events in the previous episode, Oliver and Diggle race to rescue Thea, while Felicity, Curtis and Noah (guest star Tom Amandes) join together to stop Darhk (guest star Neal McDonough).
Oliver teams up with a surprising force in an attempt to stop Damien Darhk (guest star Neal McDonough) and his magic once and for all.