To track down William and deal with Damien's mystic powers, Oliver call in a mystic ally of his own: Vixen, who can channel the spirits of any animal.
Oliver prepares to go up against Damien's wife in a debate of mayoral candidates. However, first he has to deal with a team of villainous demolition experts who plan to hit a major target. Meanwhile, Donna has second thoughts about her relationship with Quentin, and Curtis prepares a special engagement gift for Felicity.moreless
When Mulder and Scully try to discover what unseen force may have driven a scientist to commit suicide, they turn up a laboratory where extreme genetic experimentation has bred subjects possessing dangerous powers.moreless
While Oliver and the team hunt down Damien, Lyla gives Diggle some advice on how to deal with Andy. In the past, Reiter makes a deal with Oliver.
After Damien launches an attack on Oliver and his people at the bay, Oliver retaliates by exposing Damien and HIVE to the public. However, Damien has another trick up his sleeve. Meanwhile, Felicity finds Oliver's engagement ring, and Diggle tries to get the truth from an imprisoned Andy.moreless
Diggle discovers that his brother is one of Damien's Ghosts, and Oliver insists on trying to rescue him. Meanwhile, Damien offers Oliver a deal, and Ray contemplates his future now that he's back from the dead.moreless
Team Arrow launches an attempt to rescue a miniaturized Ray from Damien's stronghold. Meanwhile, Felicity begins to wonder if she's losing herself in her relationship with Oliver, and Donna arrives in Star City to pay her daughter a visit.moreless
When Sara starts killing people, Oliver realizes that her body is without a soul and calls in a mystical friend--John Constantine--to reunite Sara's two halves. Meanwhile, Damian sends Quentin on a mission, and the police captain discovers information about Diggle's brother Andy.moreless
Laurel returns Sara to Star City to reunite with Quentin, but neither one of them reacts as she hoped. Meanwhile, Green Arrow and his team go after crooked cops who are ripping off drug dealers for personal profit, and Oliver prepares for his mayoral candidacy.moreless
In the Camelot of six weeks past, Emma tries to determine how Merlin was trapped in a tree. However, Arthur attempts to thwart Emma once she discovers the ingredient necessary to free the wizard. Meanwhile, Merida trains Gold to be the hero that Emma needs, and Henry asks Violet out for a date.moreless
While Oliver and Diggle set aside their differences to take on a new metahuman in Starling City, Thea and Laurel travel to Nanda Parbat to resurrect Sara and help Thea overcome her growing bloodlust.moreless
Alec decides to meet Jason's mother and Kiera learns what the machine will be used for. Kellogg discovers what his future doppelganger has planned in the present and asks Kiera to help stop him.moreless
The killer: Stacy Lawford, the victim: Nika Reid
Stacy works for an online gossip blog called Wicked City while Nika is an assistant to well-known but sleazy photographer Eric Sharpe. Stacy and Nika are also best friends and roommates. Upon awakening after a night of partying, Eric finds Nika's dead body in his bed. He can't remember what happened the night before and when the murder weapon is tested for fingerprints, only his are on it. Combined with Eric's lack of cooperation with police, he becomes their prime suspect. Meanwhile, Sergeant Gavin Saunders of Internal Affairs continues his investigation into the Neville Montgomery case.
The 2nd Mass finds refuge in a Volm hideout, but tensions with the Volm continue to rise. Meanwhile, Tom teams with Weaver and Cochise in a search for Matt, and Anne reconnects with Lexi.moreless
We find the remaining 2nd Mass outside of Charleston when they are suddenly under attack from a new Espheni threat, dangerously different from anything they have previously faced. Finding themselves separated from each other, The Masons must find ways to survive by building new friendships and acquiring new skills and abilities.moreless
When an informant is murdered, Leslie must work with Callum to solve the crime. Jake finds himself getting involved in Callum's life, and Tinny earns some respect from an unexpected source.
Jake, Malachy, and Des go off for some male-bonding time on a fishing trip, only to discover a dead body. Rose finds a new friend has a dark side, and Leslie teams up with Callum.moreless