While piloting a tourist space cruise, pilot Ace Am's ship was caught in the magnetic field of a comet. After evacuating the ship, Am was himself unable to escape, slipping into suspended animation and being carried to another solar system by the comet's intergalactic orbit.

Eventually, his ship crash landed on an asteroid and Am awoke in an underground cavern, the headquarters of a now deceased alien named Zobra.

Zobra had invented a weapon which would transform whomever it was fired at into a duplicate of the being firing the weapon. Each of Zobra's four lieutenants, from four different alien worlds, was armed with one. At precisely the same moment, all four fired at Am, with the result being Am's transformation into a conglomeration of the four aliens. Using the powers he gained from this transformation, Am defeated the four, and after repairing his spaceship, ventured to Earth.

Am, now having taken the name Ultra, found that he could not transform back to his humanoid form and devoted much of his time to finding a cure for his transformation. During a battle with Doctor Dynamo, Ultra discovered that the villain's Demoleculizer could restore his true form.

However, when he had to regain his Ultra form to defeat Dynamo, the villain destroyed the Demoleculizer, again trapping Am in his alien form. Further to attempts to effect change eventually proved successful (though not without mishaps on the way) and Am built a hyper-converter disc which enabled him to alter his form without any trouble.