Earth Prime (or 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 (although it appears to be the case that such Prime Earths — and sometimes the 'central universes' in which those Prime Earths exist as well — are portrayed in fiction to be vital to the existence of the other Earths). DC Comics In the DC Multiverse Earth-Prime is the true Earth from which all the other worlds within the Multiverse originate, the "actual" reality where the readers of DC Comics live (and where DC Comics operates as a publisher), and is an Earth where all superheroes are fictional. Earth-Prime does, however, became an alternate reality in its first appearance in The Flash #179 (May 1968), when the Flash accidentally travels there from Earth-One by being pushed by a creature called The Nok. The Flash, stranded, contacts then-DC Comics editor Julius Schwartz, who helps him construct a cosmic treadmill to return to Earth-One. Eventually, it was stated that the writers of DC Comics of Earth Prime subconsciously base their stories on the adventures of the heroes on Earth-One and Earth-Two. In The Flash #228 (July/Aug 1974), Earth-Prime's Cary Bates travels to Earth-One, where he discovers that the stories he writes are not only based on events on Earth-One, but can actually influence these events as well. This power turns for the worse in Justice League of America #123 (October 1975), when Bates is accidentally transported to Earth-Two. The interdimensional trip temporarily turns Bates into a supervillain, and he quickly kills the Justice Society of America. Luckily, fellow DC writer Elliot S. Maggin, with the help of the Justice League and the Spectre, is able to restore matters on both Earths in Justice League of America #124 (November 1975). Ultraa The first superhero of Earth-Prime is Ultraa, introduced in Justice League of America #153. Like Superman, Ultraa was the sole survivor of a destroyed alien