Crossbones (Brock Rumlow) is a fictional character, a supervillain in the Marvel Comics universe. He was created by writer Mark Gruenwald and artist Kieron Dwyer in Captain America #359-360 (1989). Crossbones usually appears as a henchman of the Red Skull. He carried out the assassination of Captain America, although Sharon Carter, who was under hypnosis at the time, is believed to have fired the fatal shots.
Crossbones first appeared during the "Bloodstone Hunt" storyline in the issues of Captain America. Technically, he first appears in issue #359, in one panel as a figure watching from the shadows. In the next issue, he is shown in costume, but again he simply observes the Captain and his allies from afar. He later reveals his name to Diamondback before knocking her unconscious.
Young Brock Rumlow led the Savage Crims gang on New York's lower east side. After he brutalized fifteen year old Rachel Leighton, two of her brothers assaulted Brock, and the elder brother was killed. Rumlow fled, entering Taskmaster's school for criminals. Within three years, he became an instructor there under the name Bingo Brock.
As a mercenary, Rumlow enlisted with the communist Red Skull (Albert Malik) in Algeria, serving him under the name Frag until he was sent to invade Arnim Zola's Switzerland chateau. Ultimately the only team member to survive the assault, Rumlow there met and impressed the original Nazi Red Skull (Johann Shmidt); this Skull accepted Brock’s services, code-naming him “Crossbones.”
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