Bruce was a young man whose spy parents were assassinated by members of HYDRA. Wanting revenge, Bruce Wayne enlisted in S.H.I.E.L.D. where he was trained by World War II veterans Nick Fury and Sgt. Rock. After promotion through the ranks, Bruce eventually used S.H.I.E.L.D. as a tool for his vengeance against Green Skull, who had killed his parents, though there were rumours that Bruce had used his fathers' money to buy S.H.I.E.L.D., rather than wait for promotion. Nick Fury commented that the number of times Bruce had killed to get to Green Skull had caused his soul to virtually disappear.
Bruce was last seen in HYDRA Base Omega fighting Selina Luthor and Baron Zero, though he wasn't seen leaving the building, and so it is unclear if he survived the inferno that followed, but likely he did, since Bruce appears in JLX Unleashed # 1.
Outside of S.H.I.E.L.D., Bruce enjoys a relationship with Barbara Hardy, who is a S.H.I.E.L.D. agent operating under the name of Black Bat.