Frank Grillo's Crossbones Is Reportedly Main Antagonist Of CAPTAIN AMERICA: CIVIL WAR After making an appearance in this year's Captain America: The Winter Soldier, it's been widely speculated that Frank Grillo's Brock Rumlow, aka Crossbones, would play a significant part in future Captain America movies -- after all, he is the one that assassinated the Star-Spangled Avenger at the close of Marvel's Civil War event. However, Grillo seemingly knows very little about Marvel's cinematic version of Civil War, which will see Iron Man go head-to-head with Cap as in the comic, informing his Twitter followers about a week ago that he kn

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