Marvel Studios employee who worked on 'Captain America 4' describes tensions on set: Harrison Ford “was very much a diva."

For Nigerian-American director Julius Onah (“The Cloverfield Paradox”), entering the MCU with “Captain Marvel: Brave New World” provided the opportunity to make a paranoid thriller, one in which Anthony Mackie’s Sam Wilson, the new, untraditional Captain America, must stop a global threat involving the powerful substance adamantium.