Tim Roth and Sophie Okonedo will star in a BBC TV drama based on the aftermath of the 2004 tsunami disaster, to be broadcast later this year.
The joint project with US network HBO also features Toni Collette, Hugh Bonneville and Chiwetel Ejiofor.
It is written by Abi Morgan, whose credits include Sex Traffic.
"It's a tribute to the power of Abi's writing that such an extraordinary cast has come together," said BBC Two controller Roly Keating.
Filming on location in Phuket and Khao Lak has begun. Production company Kudos is working with local communities and the piece will feature various locations and landmarks affected by the tsunami.
"Through meticulously researching real-life events, real people and working closely with the survivors' groups, Abi has written a wonderful, powerful drama that purposely asks what mankind can learn from the event," said executive producer Jane Featherstone.
Other actors involved include Gina McKee, Kate Ashfield, Samarit MacHielsen and Grirggiat Punpiputt.