CNBC: Last year, after Twentieth Century Fox’s “Fantastic Four” flopped and Disney’s “Avengers: Age of Ultron” underperformed, box-office watchers asked: Had superhero movie fatigue finally set in? But after only its second week in North American theaters, Marvel’s “Captain America: Civil War” has earned $941 million globally, while Marvel-branded superhero movies have reaped $10 billion collectively.