Vanessa Kirby at the premiere of The Fantastic Four: First StepsThis article contains spoilers for The Fantastic Four: First Steps.Fantastic Four star Vanessa Kirby has cleared up one of the biggest mysteries surrounding the new Marvel movie.The former star of The Crown plays Sue Storm in the rebooted Fantastic Four film First Steps, in which she’s joined by Pedro Pascal, Joseph Quinn and Ebon Moss-Bachrach.