63 minutes
									
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    			| Person | Character | 
|---|---|
| Jared Harris | Valery Legasov | 
| Stellan Skarsgård | Boris Shcherbina | 
| Emily Watson | Ulana Khomyuk | 
| Paul Ritter | Anatoly Dyatlov | 
| Jessie Buckley | Lyudmilla Ignatenko | 
| Adam Nagaitis | Vasily Ignatenko | 
| Robert Emms | Leonid Toptunov | 
| Sam Troughton | Alexandr Akimov | 
| David Dencik | Mikhail Gorbachev | 
| Alex Ferns | Glukhov | 
| Mark Lewis Jones | General Pikalov | 
| Ralph Ineson | General Tarakanov | 
| Alan Williams | KGB Chairman Charkov | 
| Barry Keoghan | Pavel | 
| Person | Position | 
|---|---|
| Johan Renck | Director, Co-Executive Producer | 
| Craig Mazin | Writer, Creator, Executive Producer |