Stellan Skarsgard and Emily Watson are set to join the Sky/HBO co-production Chernobyl.
The actors will join five-part mini-series which is based on the real-life events of the Chernobyl nuclear disaster.
The series is a co-production between Sky and HBO, meaning that it will air at the same time in both the UK and US.
Skarsgard is set to play Boris Shcherbina, head of the Bureau for Fuel and Energy of the USSR, as he tackles the disaster in its early hours.
Emily Watson will take the role of Ulama Khomyak, a nuclear physicist attempting to solve the mystery around what led to the disaster itself, which will expose her to a deadly secret.
The pair will join Jared Harris (Mad Men, The Crown), with the series the latest in Sky and HBO’s partnership, which is worth $250 million.
Speaking about the role Stellan Skarsgard said that he was excited to be working with Emily Watson again.
“Nobody would see it as a privilege to spend five months in a dilapidated nuclear plant, unless it was to play in a script like this by Craig Mazin, work with a director like Johan Renck, collaborate with a producer like Jane Featherstone, jam with an actor like Jared Harris and finally be at the feet of Emily Watson whom I have been missing for some twenty years.”
Watson added that she was honoured to be working on such an important project.
“This is a significant piece of work and I'm honoured to be part of it. I can't wait to get started with this amazing group of people, and am especially excited to be working with Stellan again.”