HBO's 'Chernobyl' br Is the Top-Ranked br Show of All-Time The five episode miniseries br has a 9.7 star average rating br on the movie and television br database website, IMDB. Chernobyl is now ahead br of Breaking Bad, Game of br Thrones and Planet Earth II. 140,000 users br have rated the show. The series is a dramatization br of the worst nuclear power br plant disaster in history. In 1986, reactor four of the br Chernobyl nuclear power plant —br located in the former Soviet Union — br exploded during a safety test. The explosion released br more that fifty tons of br radioactive material br into the atmosphere. Created by Craig Mazin, br the series stars Jared Harris, br Stellan Skarsgaard and Emily Watson.