A "New government weaponâ€ with the explosive power of 100 hydrogen bombs (Act No. 222, Nov 1956: "The Duplicate Superman!") (TGSB).
Superman is miraculously spilt into two virtually identical Supermen by an awesome new explosive force of a powerful Q-Bomb a "New government weaponâ€ with the explosive power of 100 hydrogen bombs. The two Supermen are called Superman-T and Superman-X. The Supermen work together as a super-heroic team until one of them, Superman-T, finally sacrifices his life to save the other from the effects of a gigantic Kryptonite meteor hurtling toward Earth. Upon Superman-Tâ€™s death, Superman-X regains all his former powers. (Act No. 222, Nov 1956: "The Duplicate Superman!").