Black Widow to have 'big part' in Avengers: Age of Ultron

Scarlett Johansson's Black Widow will play a "very big" part in 'Avengers: Age of Ultron'.

The 29-year-old actress is to reprise her role as the Black Widow, Natasha Romanoff in the upcoming superhero sequel and Marvel's Kevin Feige has revealed she will be integral to the plot.