The Best Episodes Written By Marc Guggenheim

Oliver assembles a group of unlikely allies - Slade, Nyssa, Merlyn and Digger Harkness - to engage in an epic battle against Chase and his army.

After eight seasons, and the launch of countless superheroes, the series wraps up the story of the Green Arrow.

Oliver and Diggle race to stop the Dark Archer from unleashing his vengeance on The Glades. However, they run into a roadblock after Detective Lance picks up Felicity for questioning. Tommy and Oliver's already tumultuous relationship takes a turn for the worse after Oliver makes a confession about Laurel. After hearing of the danger in The Glades, Thea races to find Roy, inadvertently putting herself directly in the line of fire for Malcolm's devious plan. On the island, Oliver, Slade and Shado are locked in a life-or-death struggle against Fyers as his missiles lock on a full Ferris Air jetliner.

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.

Douxie, Claire, Steve and Jim meet the legendary King Arthur and his sister, Morgana, in medieval Camelot — where being a troll is punishable by death.

Briscoe bids farewell to the 27 as the prosecution of two women for killing each other's husbands comes to a successful conclusion.

Sara and Roy become prisoners at the Slade and the only one who is able to save them is Oliver Queen.

A crossover event that began on "The Flash" concludes with Oliver teaming with the Flash to stop a boomerang-wielding killer who plants five bombs in the city that are set to explode at the same time.

Demetri and Mark travel to Utah in search of a suspect who might be connected to the global blackout, while Olivia runs into the man from her vision.

Still reeling from the discovery of the amulet's power, a stunned Jim meets his new mentors and learns he's been tasked with a sacred responsibility.

Lovers Philo and Vignette risk their lives to help the oppressed Faefolk of Carnival Row.

Sarah accompanies Kitty to Senator McAllister's hometown to interview local residents for his upcoming election campaign, where she meets his high school sweetheart Alice. The pair meets up with some local high school seniors at a bar, and attends a party with them. Rebecca asks Justin to attend a house party with her, who ends with Justin getting a black eye; while Chad makes a surprising decision to come out that affects his relationship with Kevin in a negative way. Meanwhile, at the advice of her best friend, Nora asks her professor out on a date. And Kitty returns to L.A. with new insight on McAllister and admits that she's falling in love with him.

After performing a dance act in the courtroom, Eli's capabilities of practicing law have come under scrutiny and he appears before State Bar of California for a hearing to determine whether he's fit to practice law. However, its Taylor who pleads to her dad, Jordan, to defend Eli's law license. Jordan agrees to represent Eli but another situation develops, Nathan has to decide whether he should protect his brother or shall tell the truth.

With Oliver and Barry still stuck in the other’s bodies, the two get a lead on John Deegan and head to Gotham City with Supergirl to figure out why their reality has changed. While there, they meet the mysterious Kate Kane who provides them with information that leads the group to Arkham Asylum. The crossover starts on The Flash S05E09 Elseworlds (I) and concludes on Supergirl S04E09 Elseworlds (III).

A Nazi claims to have knowledge about the blackouts. Meanwhile, Demetri receives an anonymous tip about the future, and Aaron tries to get approval to have his daughter's body exhumed.

The bludgeoning of two women in their apartment leads the detectives to a suspect who has taken a hostage while demanding legal representation ... and Southerlyn's actions, while heroic, results in disbarment proceedings against her for violation of Disciplinary Rule 1-102.

After Oliver is shot, he turns to a surprising person for help - Felicity. Diggle is stunned when he sees Felicity walk through the front door of the lair dragging a dying Oliver behind her, and the two team up to save Oliver's life. As Oliver hovers between life and death, he flashes back to a seminal event on the island - a daring escape attempt with his new friend Slade Wilson.

Diggle and Felicity travel to the island of Lian Yu in search of Oliver, who left Starling City after the devastation of The Undertaking and his failure to avert it. Convinced to return home, Oliver finds that things are in much worse shape than he imagined – Isabel Rochev is preparing a hostile takeover of Queen Consolidated, Thea refuses to visit Moira in jail, Roy is trying to fill the void left by the Arrow's absence, and Laurel is working with the District Attorney's office to take down the vigilante. Meanwhile, flashbacks to the island show Oliver's mentors Slade, Shado and Oliver in a desperate situation.

Ra's makes his next move against Oliver by reveling the Arrow's secret identity to Quentin. Left without alternatives, Oliver has no choice but to surrender. Meanwhile, Ray is injured in an attack and Felicity must take a risk to save his life.

The pressure mounts for Oliver who begins to wonder if he will lose everything in his battle to save Star City. A familiar face returns.

Mark must meet with a therapist to regain his badge after being suspended by the FBI; Demetri reluctantly teams with CIA agent Vogel to search for Lloyd; Janis learns family secrets about Simon.

When a massive timequake rocks the ship while the legends are preparing for their next destination, they must break a cardinal rule of time travel.

After pushing a broom for centuries, Merlin's apprentice, Douxie, springs into action when the great sorcerer asks him to find the Guardians of Arcadia.

Oliver discovers that after he and his father went missing, Moira and Thea stopped celebrating Christmas. Determined to make up for lost time and restore a sense of normalcy to the Queen household, Oliver decides to throw the family a Christmas party. Meanwhile, Tommy asks Laurel to spend Christmas with him but she points out that Christmas was also her sister Sara's birthday and she needs to be with her father. Tommy suggests changing things up might be the best way for everyone to heal but Laurel isn't sure her father is ready for that. Meanwhile, Diggle tells Oliver someone is murdering the people on his father's list with arrows, which sends Oliver off to face his toughest adversary yet.

The Count has a new scheme to turn Starling City's residents into clients by addicting them to a new drug and then selling them Vertigo to cure it. among those stricken are Diggle and DA Donner, who collapses in the middle of presenting his case against Moira.