After Slade threatens to take everything Oliver loves away, Oliver decides the fastest way to stop further bloodshed is to surrender to his enemy. Knowing that surrender will surely lead to Oliver’s death, Diggle and Felicity go to extreme measures to keep Oliver from confronting Slade. Meanwhile, Thea considers leaving town, and Laurel resumes her crusade against Sebastian Blood. Finally, Slade unleashes his assault on Starling City.

Victims of arsenic poisoning are found in Long Beach. The investigation reveals that the killer has a fascination with Greek mythology, based on handwritten death threats to the deceased and other mysterious clues. Meanwhile, Hotch becomes concerned about participating in Jack's third-grade career day.

The team investigates the cyber-related murder of a prominent casino owner's wife and receive help from the FBI's Cyber Crime Division.

The are some job opportunities at Broadhill and Kev decides to improve his act. Vicky's taste in men concerns Hannah, while a visit from city boy Pete stirs things up for Derek.

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Sgt. Olivia Benson is investigated by Internal Affairs after William Lewis' death; as pressure mounts, Olivia has to choose between her convictions and her badge.

Phil cannot handle the stress when he tells Claire an elaborate lie; Gloria is tasked with organizing this year’s family portrait; Jay covertly enters Stella in a dog show.

Scarlett’s breakdown is driving everyone to point fingers at who might be responsible for her condition. Deacon is blaming Rayna for pushing her too fast, Rayna is blaming Juliette and for forcing her on stage and Beverly thinks Rayna is only interested in seeing her label succeed. It always feels like everyone has an axe to grind with Juliette so she turns to Avery, only to find him preoccupied with Scarlett. During her moment of weakness, she is driven right into the hands of her nemesis. Meanwhile, Layla tries to convince Will to join her in a reality show.

Clarke and Raven make contact with the Ark, and Abby guides Clarke through a dangerous procedure in a desperate move to save one of their own. Meanwhile, on the Ark, Abby is removed from the council, and former Chancellor Diana Sydney takes her place. Jaha reveals to Abby that there are not enough drop ships for everyone on the Ark to go down to Earth, and Kane begins to deal with his guilt over his recent decision.

A new mission with international stakes has Philip calling on Annelise for assistance just as an old foe returns to D.C. with a vendetta. Stan makes a discovery that could put the FBI hot on the trail of illegals.

Syria's president runs for reelection, Clay Aiken discusses his bid for Congress, a lesbian trio gets married, and Audra McDonald talks "Lady Day at Emerson's Bar & Grill."

Jim Gaffigan interview runs long, Rachael Taylor scheduled to come back Friday, May 2.

Sue frantically tries to earn a college scholarship for when she graduates high school in two years; Frankie hopes to correct a mistake at work without her boss finding out; Brick demands a formal apology from Mike after a misunderstanding.

David Spade; Sophia Bush. Also: The Both perform.