Scott Summers was the first of two sons born to Major Christopher Summers, a test pilot for the U.S. Air Force, and his wife Katherine. Christopher was flying his family home from vacation when their plane was attacked by a spacecraft from the interstellar Shi'ar Empire. To save their lives, Katherine pushed Scott and his brother Alex out of the plane with the only available parachute. Scott suffered a head injury upon landing, thus forever preventing him from controlling his mutant power by himself.

With their parents presumed dead, the authorities separated the two boys. Alex was adopted, but Scott remained comatose in a hospital for a year. On recovering, he was placed in an orphanage in Omaha, Nebraska that was secretly controlled by his future enemy, the evil geneticist Mister Sinister.