Black Widow

Natalia "Natasha" Romanoff, better known as Black Widow, is one of the most talented spies and assassins in the entire world and a founding member of the Avengers. Originally an agent of the Soviet agency for foreign intelligence, the KGB, she later became a member of S.H.I.E.L.D, the international counter-intelligence agency. Having extensive mastery in martial arts and armed with her Widow's Bite, Black Widow became one of S.H.I.E.L.D's most efficient agents.