Joining the cast of Iron Man this time is the gorgeous Scarlett Johansson. Here is her interview for the upcoming flick. Everything I've seen from “Iron Man 2″ makes me think director Jon Favreau has made a movie critics and audiences are going to love. The reason? While “Iron Man 2″ is going to have incredible action scenes, he is putting story and character first and getting great actors to play all the critical roles. And joining the cast of “Iron Man 2″ is the beautiful Scarlett Johansson. In the film, Scarlett plays Natasha Romanoff/Black Widow and it's still a guess whose side she's on.