Pre-Crisis Ultra was originally human astronaut Ace Arn, living in an unspecified future era when spaceflight is commonplace. After crash landing on a planet in a far off solar system, he is attacked by four aliens, each a member of a different species from their respective planets Ulla, Laroo, Trago, and Raagan. The four aliens simultaneously shoot him with rayguns designed to transform him into an obedient member of their respective species. Because all four rays hit him at the same time, he is instead transformed into a combination of the four aliens, possessing superhuman strength, flight, and the ability to manipulate electricity and magnetism. He combined the first letter of the worlds the four aliens were from, along with the first letter of his name to come up with: U-L-T-R-A, his new name. He soon finds a device that enables him to return to his human form, giving him a secret identity. His series lasted until issue #110 (1966), when
Mystery in Space was cancelled. He would not reappear for several years.
Post-Crisis Ultra was one of
Wizard Magazine's "Mort of the Month", a featurette showcasing comic characters considered low-quality.
Grant Morrison used him both in his run in
Animal Man (in issue #25 Ultra and other pre-
Crisis characters appear in comic book limbo) and in the
Aztek monthly series (though not shown, Ultra makes two appearances). The character appeared in
Starman #55 (1999), in which Ultra, along with
Space Ranger, is riding in
Space Cabbie's cab and looking for Starman's cosmic staff for the Space Museum. Each regales the other with different interpretations of Jack and Mikaal rescuing
Starfire from a space pirate.
Geoff Johns was the next writer to use these concepts. A storyline in
Stars and S.T.R.I.P.E. involved
Young Justice teaming with
Star-Spangled Kid and
S.T.R.I.P.E. to stop a group of Larroo (one of the four aliens from Ultra's origin) from using their ray to turn everyone in Blue Valley into Larroo. It was established that the Larroo had invented the ray, but were preparing to sell it to the other three alien races. Ultra appeared as a background character in the
Infinite Crisis event. Having apparently somehow traveled back in time to the present era, Ultra is one of the many space-faring heroes who aid
Donna Troy in the fallout of the
Rann–Thanagar War. He also appeared in
Superman/Batman #31 (2007), overwhelmed by an alien influence that is affecting many of the part-alien heroes on earth. After a highly destructive rampage through the American town of Dalesville, he leaves (causing more destruction upon his exit) with Supergirl, also affected. In "Superman/Batman" #33, he and other influenced aliens try to destroy the titular heroes. Fortunately, his mind is soon cleared of all influence and the villain behind it all,
Despero, is defeated. The planet Larroo appeared in
Action Comics #867.
Brainiac attacked the planet while searching the universe for Superman. Superman arrived but could do nothing. A city containing all four races which created Ultra was contained within a forcefield, shrunk and captured. Their star was detonated and Superman was left floating among the remains of the planet. Ultra is held on Brainiac's ship before being freed and taken into the custody of the United States government.
The New 52 In
The New 52, Ultra the Multi-Alien is re-established as the result of an experiment of
Byth Rok, in which he combined the DNA of alien prisoners in an attempt to create the Slayer of Worlds. The original incarnation of the character is reintroduced in
Justice League Unlimited (2025), where he encounters a time-displaced
Supergirl,
Mister Terrific, and
Martian Manhunter in the year 2212. ==Powers and abilities==