Garfield Wilson

Belle attempts to use the blade to get her husband to tell her where the Snow Queen is hiding; Belle goes to Arendelle to seek out Grand Pabbie's help in recovering her lost memories.

Malcolm Merlyn returns. Oliver rallies his team as Slade's soldiers attack the city. Felicity gets a call from S.T.A.R. Labs with game-changing news and Thea comes face-to-face with her father – Malcolm Merlyn (recurring guest star John Barrowman).

After Slade threatens to take away everything Oliver loves, 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.

Will and Katie question whether their family is safe in Seattle; Snyder digs up dirt on Everett Kynes; Amy parts ways with Broussard.

Kennex and Dorian investigate a crime involving a self-guided bullet; Maldonado revisits the ambush that nearly killed Kennex.

In the year 2048, Detective John Kennex and his new android partner embark on their first mission.