April 26, 1986, USSR. An explosion at the Chernobyl nuclear power plant sends workers scrambling to assess the damage.
Nuclear physicist Ulana Khomyuk makes a desperate attempt to warn Legasov about the threat of a second explosion.
Lyudmilla flouts a nurse's warnings about limiting her contact with Vasily. With the reactor fire contained, Legasov warns that a meltdown could contaminate drinking water.
Legasov and Shcherbina consider using lunar rovers to remove radioactive debris, while Khomyuk faces government hurdles in determining the truth about the cause of the explosion.
After publicly affirming that the Chernobyl explosion was caused by "operator error," Legasov weighs the price of telling the truth at the upcoming criminal trial of Dyatlov, Bryukhanov and Fomin.
Desna and the girls struggle to keep their hope alive while still working under the thumb of the new Russian regime, spearheaded by Riva.
Desna now pinned under the stiletto tipped nail of Riva's sister, Zlata must come up with an idea to generate more customers for the clinic.
Desna's relationship with Ruval deepens when he introduces her to his mother, Matilde. Polly grows concerned when Marnie continues to pull away from her.
Castle Rock (S1Ep4)
As Henry prepares for his day in court, a coffin arrives in Castle Rock.
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