Buy a Crossbones costume to become the Marvel supervillain and adversary to Captain America. In the Marvel movie series, Crossbones (aka Brock Rumlow) first appears in Captain America: The Winter Soldier. Rumlow is a SHIELD operative tasked with capturing the fugitive Steve Rogers (Captain America). Captain America, however, discloses that Rumlow is a member of a terrorist organization. In Captain America: Civil War (2016), Rumlow operates as Crossbones and does battle against Captain America. Shop our selection of Crossbones costumes for your Halloween costume: