Karla Sofen (Earth-1955)

"Lady, you are crazy! And I have an M.D. in psychiatry... So when, I say you're crazy... You're crazy."

- - Moonstone to Wonder Woman

Karla Sofen is a former archaeologist and psychiatrist who discovered ancient stones of seeming extraterrestrial origins in an abandoned pyramid at South America. When she did so, however, the power within the stones granted her powers of her own, but also insanity and prone to violence. Taking the name of Moonstone she became an international criminal.