Fan Casting Crossbones in George Nolfi's Captain America

Brock Rumlow was a career criminal who claims to have at one point enrolled in one of the Taskmaster's criminal training academies. It is unknown who he has worked for in the past. He first appeared as a member of the organization known as ULTIMATUM, working with the terrorist anti-nationalism revolutionary Flag-Smasher in an attack on the United Nations. This attack was thwarted by the efforts of Captain America and Spider-Man, who captured him and his ULTIMATUM cronies, turning them over to the authorities. Flag-Smasher escaped, and apparently some time later Rumlow was either released or escaped from prison. Some months later, now calling himself Crossbones and working alongside Sin – who claims to be Sinthia Schmidt, the daughter of Captain America's greatest World War II foe, the Red Skull – attacked a world meeting of national superheroes in Geneva, Switzerland, which Captain America was attending. Crossbones fought and crippled the Italian hero Omerta before he and Sin were taken out by Captain America, the Russian Red Guardian, and the British Union Jack working together. He was again taken into custody. How he escaped custody is unknown, but he has again appeared working alongside Sin and the criminal psychologist Dr. Faustus, who once tried to manipulate Captain America into committing suicide, in the Malay archipelago island nation of Madripoor. While at present Sin and Crossbones appear to simply be obtaining wealth by attacking banks and major businesses in Singapore, Hong Kong, and other major cities in the South China Sea, it has been revealed they are working on a greater scheme for an unknown employer. Sin and Crossbones recently fought Captain America and his trainee, Bucky, in Hong Kong, but escaped.