The Americans: Episode 4.03 “Experimental Prototype City of Tomorrow” Promo & Synopsis

Episode 6 / Production #406 – “The Rat” (Airs April 20, 10:00 pm e/p) – Martha must finally face the truth she has denied – and her life may never be the same. Plus, a chilling new development in William’s work forces the Jennings to face the realities of what a biological war would mean. Written by Joshua Brand; directed by Kari Skogland.

Source: FX