Natasha Romanoff/MZ

Natasha Romanoff was once a Russian spy who defected from the Soviet Union and became a government agent for the United States. Her skills and knowledge became a valuable asset and she became a resource of S.H.I.E.L.D. as well as a member of the Avengers. All of this ultimately means nothing as pretty much the entire Earth fell victim to a zombie apocalypse, including Natasha.