Eva Frost is a young woman from Germany who joined the Annex Project in search of a cure for the A.E. virus, which is affecting the Earth. She was raised by Adolf Reinhard and has no siblings. Her parents were overly cautious and protective, preventing her from leaving their estate. This changed when they lost their fortune and sold her to U-NASA, where she underwent the M.O. Operation.
The DNA used in the O.M. Operation was from a Planarian, and like this creature Evas body contains stem cells throughout her system, allowing her to regenerate from a minimum of her existing material, recovering with the memories of the original body.