Robert Downey, Jr. as Tony Stark in his lab.

Robert Downey, Jr. films a scene wearing a Stark body suit.

Robert Downey, Jr. during an intense scene.

Don Cheadle as James “Rhodey” Rhodes.

Robert Downey, Jr. and Gwyneth Paltrow as Tony Stark and Pepper Potts.

Gwyneth Paltrow as Pepper Potts.

Scarlett Johansson as Natasha Romanoff (Black Widow).