Karla Sofen

Karla Sofen was introduced in Captain America #192 (December 1975) as a human psychologist from Van Nuys. While serving as the psychiatrist to the original Moonstone, Lloyd Bloch, she manipulated him into surrendering his moonstone and took the fragment for herself, gaining its alien-derived powers. The moonstone is identified in later stories as part of a Kree Lifestone; Kree intelligences (including the Supreme Intelligence and figures such as Mentor and ISAAC) later interact with her regarding the stone and its imprint (Ajes'ha).

As a human, Karla Sofen is portrayed as a professional woman and former psychiatrist from Van Nuys, California. In her powered identities she takes on costumed mantles and aliases including Moonstone, Meteorite (Meteorite II in some listings), and at times has operated under the Ms. Marvel title; sources note shifts between her civilian identity and her costumed persona, but specific visual descriptions of costume detail are not provided in the cited excerpts.

Her abilities derive from fusion with an extraterrestrial 'moonstone' — a fragment of a Kree Lifestone — which grants her artifact-based superhuman powers (sources describe her as a powerful female supervillain but do not enumerate precise powers in the provided excerpts). In addition to artifact-granted enhancements, she is repeatedly characterized as a highly manipulative and self-centered individual whose professional training as a psychiatrist is used narratively to control and influence others (for example, manipulating Lloyd Bloch into surrendering the stone). The narrative record also includes technological/alien interventions on her power-source (attempts by Mentor and ISAAC to remove the moonstone and related memory alterations by Kree intelligences).