Sucker Punch is a movie about little girl who is trying to hide from the pain caused by her evil stepfather and lobotomy. She ends up in mental institution and while there she starts to imagine alternative reality. She plans to escape from that imaginary world but to do that she needs to steal five objects before she is caught by a vile man. Story is set in 1950's.
This is the trailer that was just released online: http://www.youtube.com/watch?v=6dzikBZTUy8