Karla Sofen

Dr. Karla Sofen (also known as Moonstone, Meteorite, and Ms. Marvel) is a fictional character appearing in American comic books published by Marvel Comics. She first appeared in Captain America (vol. 1) #192, created by writer and artist.

Moonstone is a former psychologist who got her powers from a fusion with a gravity stone designed by the alien Kree. The character has been depicted as both a supervillain and an anti-hero at various times in her publication history. She was a member of the Masters of Evil, Thunderbolts and the Dark Avengers, and in the latter group she temporally replaced Carol Danvers as Ms. Marvel.

Moonstone has been described as one of Marvel's most notable and powerful female supervillains.