A CIA rookie gets his first case and unknowingly investigates his parents, who are part of a Russian sleeper cell.

Katya manipulates Alex and makes him think he's mistaken when he almost exposes his parents as spies, but her lies lead to a rift in the family. Meanwhile, Victor is warned to keep the O'Connors under control and Alex teams up with an FBI agent.

A surprising discovery leaves Alex reeling as he tries to adjust his theories in light of what he found at Philadelphia City Hall. Meanwhile, the Rezident questions Katya and Mark's dedication and Natalie discovers the dangers of Black Dagger.

Victor spies on the Rezident, Alex reveals a big secret to Michelle, and Sam grows increasingly suspicious of the boy genius.

Wanted in connection to Michelle's disappearance, Alex accepts help from an unlikely ally. Natalie and Victor adjust to life on the run.

Sam and Alex join forces to find Oscar Christoph. Victor plots to take down the Rezident.