Director Vance is notified by the Pentagon that the nuclear submarine Gibbs and Bishop are aboard to conduct a murder investigation has gone radio silent.
Laurel learns about some damaging information that affects Emiko. Always looking to protect his sister, Oliver invites Laurel to help investigate, which makes Felicity happy as her friend is now working with the team. However, when things go awry, Felicity is forced to make a choice between the team and Laurel.
In the wake of Lex Luthor's return, the show flashes back to what he's been doing for the last two years and how his secret machinations and plans have affected Supergirl and Lena.
The fair at the Kingdom is underway, with all four communities coming together in celebration for the first time in years, while some pacts are renewed, other deals will come at a much steeper price.
Jeremy Clarkson, Richard Hammond and James May take an Aston Martin DBS, a Bentley Continental GT and a BMW M850i for an epic drive between the salty Black Sea in Georgia and the fresh water Caspian Sea in Azerbaijan in order to find the best grand touring car for a fish enthusiast.