Photo: courtesy of Disney+. “I want one” is something you might expect to hear about a new gadget or sports car. But in 2010’s Iron Man 2, it’s what Robert Downey Jr.’s Tony Stark says about Natasha Romanoff (Scarlett Johansson) after he meets her for the first time, setting the tone for the way characters would treat The Sexy Avenger for much of the franchise. Her introduction over a decade ago continues to be why Natasha, aka Black Widow, is a polarising figure in the Marvel Cinematic Universe.