CinemaBlend Copy to clipboard When you look Captain Americaâs rogues gallery, Crossbones is among the more prominent faces, with Brock Rumlow having been a thorn in Steve Rogersâ side in the comics for over three decades. So it made sense when the Marvel Cinematic Universe introduced the villain in Captain America: The Winter Soldier, although Captain America: Civil War took him out of the picture just a couple years later. Then Avengers: Endgame came around and provided Frank Grillo the opportunity to cameo as a past version of Rumlow, but as it turns out, the actor originally turned down appearing in the Infinity Saga capper.