Robert Downey, Jr. – 5 Feet 7 Inches Tall

Now we know why Iron Man needs that special suit — it makes Robert Downey, Jr. look a lot more imposing than he otherwise would.

Even Gwyneth Paltrow, who plays Pepper Potts in the popular action films, is two inches taller than he is. (But knowing her, that just gives her something else to feel smug about.)