Valery creates a detailed plan to decontaminate Chernobyl; Lyudmilla ignores warnings about her firefighter husband's contamination.

Cast: Jared Harris, Stellan Skarsgård, Emily Watson, Paul Ritter, Jessie Buckley, Adam Nagaitis, Con O'Neill, Sam Troughton, David Dencik, Robert Emms, Caoilfhionn Dunne, Oscar Dyekjær Giese, Barry Keoghan, Adrian Rawlins, Baltasar Breki Samper