Mad Men and The Crown actor, Jared Harris, will take on the lead role in a new five-part mini-series, Chernobyl.

The series will be a dramatised re-telling of the events surrounding the Ukrainian nuclear power plant disaster which occurred in 1986. It will explore how and why the disaster happened and the local and global responses in the aftermath. Jared Harris will play Valery Legasov, the Soviet scientist chosen by the Kremlin to investigate the accident.

The series is the first collaboration between Sky and HBO, as part of their high-end drama partnership which was announced earlier this year. Chernobyl will begin filming in 2018 and will be aired later that year.