
Frank Grillo, known for portraying Crossbones in the Marvel Cinematic Universe (MCU), came close to being dismissed by Marvel Studios on several occasions due to his tendency to disclose plot details and spoilers during his time with the franchise. Grillo first appeared in the MCU as Brock Rumlow, a Hydra sleeper agent, in Captain America: The Winter Soldier. After an intense encounter with Captain America that involved a building being destroyed, Rumlow surprisingly reappeared (similar to Palpatine) in Captain America: Civil War, this time adopting a costume based on his comic book character and assuming the role of Crossbones. Given the massive scale of the MCU and the constant hunger of scoopers, paparazzi, and fans for insider information, maintaining secrecy is crucial to Marvel Studios, and it almost led to Grillo’s termination.