72 minutes
									
				info
				
			
 
		
    			| 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 | 
| Con O’Neill | Viktor Bryukhanov | 
| Adrian Rawlins | Nikolai Fomin | 
| Sam Troughton | Alexandr Akimov | 
| Robert Emms | Toptunov | 
| Alan Williams | KGB Chairman Charkov | 
| Michael McElhatton | Prosecutor Andrei Stepashin | 
| Person | Position | 
|---|---|
| Johan Renck | Director, Co-Executive Producer | 
| Craig Mazin | Writer, Creator, Executive Producer |