Ultraa is a DC Comics character, originally the first superhuman on Earth Prime. The original first appeared in Justice League of America #153, he was created by Gerry Conway and George Tuska. The current Ultraa first appeared in Justice League Quarterly #13, written by Kevin Dooley and drawn by Greg LaRocque. A new version of Ultraa appears in Grant Morrison's The Multiversity project.

Earth Prime is a term sometimes used in works of speculative fiction, most notably in DC Comics, involving parallel universes or a multiverse, and refers either to the universe containing "our" Earth, or to a parallel world with a bare minimum of divergence points from Earth as we know it — often the absence or near-absence of metahumans, or with their existence confined to fictional narratives like comics. The "Earth Prime" of a given fictional setting may or may not have an intrinsic value to or vital connection to the other Earths it exists alongside.