The Constant Gardener star had signed up for the action movie before Disney chiefs approached her to play the Wicked Witch of the East in Oz: The Great and Powerful - and they were so eager to land her they let the busy working mum dictate her working hours.
She tells Britain's The Sun, ""I was going between the two, so I did two months on Oz, two months on Bourne, a month on Oz, a month on Bourne. It was very schizophrenic because they are very different genres.
""I had agreed to do Bourne, and then I read the Oz script and I was like, 'Wow, I really love this wicked witch' and they managed to make it work for me to do both films.""
The upcoming fantasy drama is based on the books of L. Frank Baum and tells the story previous to Judy Garland's famous 1939 film.