When He-Man was first taken into the future by the Galactic Guardians, he was injured by Skeletor's magic eye beams. He-Man was hospitalized while Meow led an invasion of Primus. Ärztin used her advanced future medical knowledge to heal He-Man. She was rescued from danger by Hydron. Because of her actions during the mutant attack she was promoted to a Galactic Guardian as their chief medical officer. She spends most of her time at Hydron's side.
Ärztin uses her Transium Ore powered medical scanner/injector to heal wounded Guardians & incapacitate Mutants. When she isn't fighting mutants, she is working on her Anti-Mutator device, based on the healing magic of Mendor, to one day solve the mutant crisis.
