There aren't many people who can defeat Dwayne 'The Rock' Johnson in a duel, but Scarlett Johansson is one of them. A few weeks ago in the States, Johansson's brain-busting sci-fi Lucy, directed by Luc Besson, beat Hercules into second place with a remarkable opening weekend of $43.9 million. It's the latest success story in the career of Scarlett Johansson, who has had one hell of a year, matching critical adoration with commercial success and creative fulfilment.