Adam Bomb was a SPB who was a living atomic bomb, capable to explode in the same way as the Hiroshima atomic bomb. However Adam could not control his own powers, as the atomic reaction was accumulating until reach critical mass and releasing a destructive explosion, a situation than Adam regrets deeply.
He was created in the high point of the Cold war but was finaly decommissioned until his death.
However when the villian Ghoulgotha make the dead rise, Adam was one of the revived, starting to explode again, everytime with stronger levels of damage. The Authority quickly put an end to his post living existence to his own relief.