Is Frank Grillo a crossbone? What If… Zombies!? Frank Anthony Grillo portrayed Brock Rumlow/Crossbones in Captain America: The Winter Soldier and Captain America: Civil War. He also portrayed an alternate Brock Rumlow in Avengers: Endgame.
Is Frank Grillo trained in martial arts? Veteran actor Frank Grillo has trained as a boxer and martial artist for nearly four decades. That commitment has led to some of the most physical roles in the movie industry, including Boss Level which premieres on Hulu March 5.