Chernobyl Episode 4 Cast Pavel, See actors, directors, and more behind the scenes. "Episode 4" (originally: "The Happiness of All Mankind") is the fourth episode of Chernobyl. An old "Chernobyl" The Happiness of All Mankind (TV Episode 2019) - Cast and crew credits, including actors, actresses, directors, writers and more. The Happiness of All Mankind: Directed by Johan Renck. Episode summary, trailer and screencaps; guest stars and main cast list; and more. It was written by Craig Mazin and directed by Johan Renck. Valery and Boris attempt to find solutions to removing the radioactive debris; Ulana attempts to find out the cause of the explosion. Discover the cast and crew of Chernobyl: Miniseries, Episode 4 on Rotten Tomatoes. While the "Liquidators" must kill all the dogs and cats in the exclusion zone, Legasov wonders how to remove the highly irradiated graphite from the reactor's roof. 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. 4pb, gnv0, sdb, p3gyfx8, pa, 3alhy, h8j, ri, 1cr8yg, 42o,