Uno is raised from childhood by a secret organization named the Q Society to be the champion of Quetzalcoatl and battle their enemy, the deity Tezcatlipoca.

[2] After his training is completed, he enters the United States and assumes the identity of recently deceased physician Curt Falconer.

[4] Aztek later joins the Justice League,[5] but resigns after learning that Lex Luthor is a benefactor of the Q Society.

He wears an ancient helmet and armor powered by a "four-dimensional mirror", from which he derives flight, infrared and X-ray vision, invisibility, intangibility, bodyheat camouflage, entrapment nets, plasma beams and density manipulation, as well as augmenting his peak physical abilities to superhuman levels.

The original run of the eponymous title has been collected as a trade paperback: JLA Presents: Aztek, the Ultimate Man (by co-authors Grant Morrison and Mark Millar, and pencils by N. Steven Harris, and inks by Keith Champagne, 1996; collects Aztek, the Ultimate Man #1–10, 240 pages, April 2008, ISBN 1-4012-1688-9).