Actress Megan Fox was attached to the film when the film 's production company , Mythic , began promoting it to investors at the 2008 Cannes Film Festival . Fox left the film and was later replaced by Kate Mara . Due to the decreased amount of credit and financing available in 2009 , the budget of the film was reduced and the entire supporting cast was changed , with the exception of actors James Purefoy and Paul Giamatti . Producer Andrew Curtis described the financing of the film as " more complex than a London Underground map " to '' Variety '' magazine ; the film ended up crediting 18 executive producers
2008 Cannes Film Festival
2008 Cannes Film Festival
Ironclad (film)