Grimhild Kurtz commands as a high-ranking Nazi officer during World War II. She discovers and formally adopts a severely injured, amnesiac young girl, Erna Kurtz. Despite her stern and controlling nature, Grimhild genuinely regards Erna as her own child. She personally oversees Erna's rigorous training, transforming her into a highly effective operative described as a killing machine. Their relationship fractures irrevocably when Erna inflicts a grievous injury upon Grimhild during a confrontation, costing Grimhild one eye and turning them into adversaries.

Grimhild commands the clandestine URDA project, a critical Nazi initiative aiming to alter history and prevent the Third Reich's defeat using time travel technology. This technology originates from a marooned extraterrestrial vessel. Her strategy involves capturing individuals from the future possessing knowledge of this technology, leading to the apprehension of Alan, a time traveler and companion to Clis. Alan becomes her prisoner.

Her pursuit of URDA's goals brings her into direct conflict with Erna Kurtz and Janet Hunter. During a critical encounter centered on preventing the misuse of the time-travel technology, a violent confrontation erupts between Grimhild, supported by her soldiers, and Erna and Janet. This clash coincides with the attempted departure of the time-travel vessel carrying Clis. Grimhild perishes during this armed struggle over the vessel, her death occurring alongside Alan's in the conflict.

Nevertheless, Grimhild's foundational view of Erna as her daughter persists even through their estrangement and violent confrontation. Her character arc concludes definitively with her death.