Astronauts: Johnny Storm, Ben Grimm, Reed Richards and Susan Storm, fly an experimental rocket out into space. They accidentally pass through a cosmic ray storm, altering their physical structures into what they eventually call themselves The Fantastic Four. The Thing was "their Heavy," Mr. Fantastic the bore and the brains, the Human Torch was the flying bravado of the team and Torch's sister, Reed's fiance became The Invisible Girl (later The Invisible Woman). who learned to project a force field as a defensive and offensive weapon.