VIDEO : Scarlett Johansson Hints of Darker Side to Next 'Captain America'

The next "Captain America" film will be darker than previous Marvel superhero films, U.S. actress Scarlett Johansson has hinted.
The Hollywood actress will reprise her role as the Black Widow in "Captain America: Civil War", due for release in 2016, alongside her "Avengers" co-stars Chris Evans and Robert Downey Jr. Johansson was among a star-studded line-up at the London premiere of the "The Avengers" sequel, which drew hundreds of screaming fans, some of them dressed up as their favorite Marvel comics superheroes.??