A surprising visit from Nas leads the team to investigate a dangerous piece of technology that was stolen from the NSA. Roman and Blake grow closer as they attend a high-stakes poker game.

Reade confronts Zapata, while the team follows a lead to a potential cure for Jane.

Jane's past with Shepherd and Sandstorm both helps and hurts the team's efforts to stop the sale of a device that will weaponize stolen plutonium.

Dominic begins to enact Madeline's cataclysmic scheme as the team rushes to stop him. Tensions rise as past secrets begin to unravel.

In order to stop a terrorist group from procuring a deadly chemical weapon, the team must remember key details from their first days at the FBI. Meanwhile, Weller worries after he gets scary news about the health of his daughter.

With the surviving members of the team captured and held in FBI custody, Madeline and Ivy are in the final stages of their plan, but a few unlikely allies come out from the woodwork, trying to stop her before it's too late.