John Krasinski and his wife Emily Blunt both lost out on major Avengers roles back when the MCU was in its infancy. Blunt was originally Iron Man 2 director Jon Favreau’s pick for the part of Black Widow, before she had to pull out due to scheduling conflicts and Scarlett Johansson ended up snatching it from her grasp, and Marvel was keen to compare Krasinski with its other Captain America: The First Avenger choice, Chris Evans, before making a firm casting decision for Steve Rogers.