Emma Murdoch

Jennifer Connelly plays this sultry 1940s-esque noir lounge singer in 1998's unsung Dark City. At the end of the movie she's implanted with new memories and becomes Anna, who isn't a singer. Actually, technically, she's not really Emma either. No one is who they are, because the whole weird city is part of an experiment where aliens constantly change out people's memories. Oops, spoiler!