Agent Gerber was a member of S.H.I.E.L.D.
After Russian arms dealer Mikhail Fjodorov and their business partners General Starodoub and Yuri Klementiev were able to obtain a missing bootleg Starktech from Hammer Industries, S.H.I.E.L.D. agent Natasha Romanoff was ordered to get undercover and approach Fjodorov in order to interrogate him.
However, an assassin going by the name of Sofia, killed Fjodorov and challenged Romanoff to compete her for the mantle of the "Black Widow", but only under the condition that she works alone and without S.H.I.E.L.D.'s support.
However, Sofia discovered Perez and Gerber, killing them as she thought that Romanoff was still acting with S.H.I.E.L.D.'s support.
After Romanoff was saved by Coulson from sinking in the freezing waters under an ice hockey rink in Sochi, Coulson and Romanoff lamented Perez and Gerber's death, while Romanoff swore to avenge their deaths.
- S.H.I.E.L.D. (First Incarnation)
- Sofia - Killer