Bewitched (1945)

There are two women living inside the body of Joan Ellis, played by Phyllis Thaxter. Joan would rather kill the body than allow the aggressive Karen to kill the man she loves. It’s all incredibly silly and scientifically questionable, but it does have Edmund Gwenn as the doctor trying to save Joan from herselves. There is some nice tension and interesting flourishes, such as having a different actress portraying Karen’s voice, that make the film much better than it probably should be.