Jack Magniconte was an up and coming quarterback for the New York Smashers who was making use of a special vitamin cocktail produced by his brother, Steve, who makes a living selling such products to various sports leagues. One day, after a narrow victory on the field, Jack stopped by Steve's building with his wife, Darlene, only to find that Steve had supposedly had a breakthrough in his field.
This breakthrough came in the form of the Intensifier, an odd device Steve had built to increase human muscle mass and reaction speed. Jack agreed to let Steve try his device out on himself, so he could gain an 'edge' on the football field, though the trial wouldn't begin until the very next day. That night, however, as he discussed the Intensifier with Darlene, the White Event occurred.
While most folks were unaffected by the blast of strange, brilliant energies all around them, Jack found that the White Event had made him quite dizzy. As such, Darlene helped him home so he could prepare for Steve's experiment the next morning. When Steve eventually strapped Jack into the Intensifier and activated the machine, it exploded with strange, crackling energy, energy that forever altered Jack!
It seems that the combination of the White Event's energies and the Intensifier's manipulations had acted to add significantly to Jack's muscle mass, and even changed his hair color to bone white! Of course, that wasn't all, in that Jack found over the next couple of days that he had experienced a dramatic increase in strength - he could lift ridiculous amounts of weight - and he'd become rather resilient.
Using his newfound 'edge', Jack went on to dominate pro football with the Smashers, and his closest friends, Beauford 'Brick Wall' Wohl, 'Suicide' Smythe, and Dallas 'Dasher' Corbin received lots of big-money promotional deals as a result. However, towards the end of the season, Jack found that he no longer cared about football, if only because his tremendous abilities removed all the challenge from the game.
As such, after his brother Steve was accidentally killed by an irate, less than scrupulous moneylender, Jack decided that he wanted to use his powers responsibly, in order to actually help people that have nowhere to turn - like his brother Steve had apparently been. To that end, he founded Kickers, Inc. with Darlene and his football buddies, a group that would look into all kinds of bizarre mysteries.
Jack acted in this capacity for over a year, helping his buddies to help the helpless deal with all kinds of bizarre issues across the country - and beyond. However, he was eventually menaced by a C.I.A. operative that had figured out what Jack was, and wanted him to join 'the Company'. Jack refused, and after learning that the Draft had been reinstated in the wake of the Pitt, he re-enlisted.
Jack had been a reservist before getting into pro football, you see, and was able to enter the armed forces as an officer as a result. Furthermore, due to his exceptional physical abilities, he was entered into a special training program that would give him full mastery of his powers, thus allowing him to serve the government as a sort of paranormal super-soldier: the All-American!
Since the Army needed a charismatic fellow to lead their forming Paranormal Platoon, however, Jack was chosen to head up that group before being put into patriotic action. He led the group through its formative stages, and even assisted his superior, Major Kathy Blizzard, in heading an operation into Africa that caused World War Three (though it wasn't their fault, of course).
After the war, Jack served with the Paranormal Platoon for a time, though he eventually returned to his role as the All-American, fighting crime and injustice for America until he was summoned by Nightmask to help ward off an invasion by cross-time thieves bent on stealing the Star Brand. Jack fought with the heroes Nightmask assembled until cosmic forces intervened in the battle.
You see, the earth itself was drawn into the timeline from which the invaders issued forth during the fight, and after the so-called Stranger defeated the chief villain in this scheme, Skeletron, Jack's world was trapped there. Furthermore, it was sealed away from the rest of this universe by the Living Tribunal, a cosmic entity from that plane who didn't want the Star Brand's energies to contaminate his realm.
Jack and his heroic cohorts were returned to his earth in the process, though his current activities since this cataclysm took place have yet to be revealed.