Business becomes personal for Sherlock when he is forced to partner with his estranged brother, Mycroft, to solve a case with life-or-death consequences.

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.

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.

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.

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.

As Miles, Monroe, Charlie and Connor rush to escape Austin, a confrontation with Texas Rangers separates Miles from the group. While out searching for Miles, Charlie is confronted by Neville who demands information on Jason’s whereabouts. As a wounded Miles faces increasingly hopeless circumstances, Aaron learns that the nanotech has been busy.

Just when there’s no one left to trust, Agent Maria Hill returns to team up with Coulson as S.H.I.E.L.D. is being destroyed around them.

When an up-and-coming professional skateboarder is gunned down by a mysterious motorcyclist, Castle and Beckett are thrust into the world of extreme sports, where the death defying stunts aren’t the only thing that’s dangerous.

Pete and Steve search for an artifact that makes a horseless chariot and a life-size chess piece come to life; Claudia combines artifacts in a desperate attempt to revive her sister.

Jon welcomes volunteers. Bran, Jojen, Meera and Hodor seek shelter. Jaime and Brienne discuss his honor. Daenerys balances justice and mercy.