Budapest

Natasha Romanoff – 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. 

 

Clint Barton – Known for his use of the bow and arrow as his primary weapon, Barton had become one of the best agents of S.H.I.E.L.D., responsible for the recruitment of Black Widow, whom he developed a strong friendship with.