Former The OC star Mischa Barton is?set to replace Sienna Miller in the new movie 'Bhopal: A Prayer for Rain,' a story of a chemical spillage in India.

The Alfie actress had been lined up to take the female lead in the film.

According to IMDB, the story follows a young rickshaw puller who gets a menial job at a chemical plant amidst the 1984 Union Carbide industrial disaster in Bhopal, India.

The movie sounds like a big bore, maybe that's why Sienna backed out!?

But now 22-year-old Barton will join former West Wing star Martin Sheen in the picture, which is due for release later this year