Maggie Nanny McPhee joins Emma Thompson in the “Nanny McPhee and the Big Bang” Maggie Gyllenhaal is reportedly joining the cast of the upcoming Nanny McPhee sequel. The Dark Knight star will join Emma Thompson in the film, titled Nanny McPhee and the Big Bang. “Big Bang” is set one hundred years after the first film. The magical nanny deals with city children and country children who are evacuees during World War II. It’s about the war and the war between these two sets of extremely different children. It is not yet known who Gyllenhaal will play in the film, which begins shooting next month.