Initially, her powers are limited to making herself invisible. However, before long Sue discovers she can make other things invisible as well as create force fields of invisible energy. After Susan is injured in battle with the Mole Man, her father escapes from prison and operates on her to save her life. Franklin makes amends with his children before returning to prison; however, the Super-Skrull finds a way to kidnap Dr. Storm, mimic his appearance, and then fight the Fantastic Four as the Invincible Man. In the process of defeating the Super-Skrull, Dr. Storm sacrifices his own life to protect the Fantastic Four from a Skrull booby trap.