The specifications mentioned in your request refer to specific digital file attributes typically found in authorized digital distribution or physical media:
Jared Harris as Valery Legasov, Stellan Skarsgård as Boris Shcherbina, Emily Watson as Ulana Khomyuk, and Paul Ritter as Anatoly Dyatlov. The specifications mentioned in your request refer to
Written and created by Craig Mazin; directed by Johan Renck. Stellan Skarsgård as Boris Shcherbina