The Best Episodes Directed By Johan Renck

Valery Legasov, Boris Shcherbina and Ulana Khomyuk risk their lives and reputations to expose the truth about Chernobyl.

With untold millions at risk after the Chernobyl explosion, nuclear physicist Ulana Khomyuk makes a desperate attempt to reach Valery Legasov, a leading Soviet nuclear physicist, and warn him about the threat of second explosion that could devastate the continent.

Lyudmilla Ignatenko, a Pripyat resident, ignores warning about her firefighter husband's contamination. Valery Legasov lays out a decontamination plan, complete with human risks.

Hank enlists Walt to investigate a theory.

April 26, 1986, Ukrainian SSR. Plant workers and firefighters put their lives on the line to control a catastrophic 1986 explosion at a Soviet nuclear power plant.

Valery Legasov and Soviet Deputy Prime Minister Boris Shcherbina consider using lunar rovers to remove radioactive debris, while Ulana Khomyuk faces government hurdles in determining the truth about the cause of the explosion.

Rick, Glenn, T-Dog, and Daryl move on after their grisly discovery to retrieve the guns when they encounter a group of scavengers who narrowly beat them to the catch. However, Glenn is kidnapped in the scuffle, which leads to a tense stand-off and a surprising discovery. Meanwhile, back at camp, the group has to handle a serious situation when Jim begins acting unhinged.

Gus increases his efforts to lure Walt back into business.

Hank suffers from the aftermath of his encounter with Tuco.

Farmer, family man and rebel Ragnar Lothbrok is determined to sail west to discover new lands and riches despite an intimidating warning from his village's tyrannical leader, Lord Haraldson, who makes it clear in no uncertain terms that doing so could result in severe consequences.

Ragnar and his crew return from their trip with treasure, and Earl Haraldson has no choice but to sanction another raid. The west is open for the taking, and the Vikings' world will never be the same.

As Cameron nears completion of the BIOS, a crisis threatens the project's future and requires all hands on deck to save the machine.

Norma's suspicions about people in town are raised, but other distractions continue to surface.

An accident exposes old wounds, complicating the already difficult situation between Danny and his family.

The journey west begins as Ragnar gathers a crew willing to risk their lives to travel into the unknown. Earl Haraldson's paranoia reaches new heights as his fear of Ragnar's success grows.

Trouble starts when oldest son Danny Rayburn comes home for the 45th anniversary celebration of his parents' hotel in the Florida Keys' Islamorada.