James Gunn's Superman movie in the new DC Universe introduces the concept that metahumans have been around for 300 years, with normal humans having a special gene that can give them superpowers.
Metahumans in DC Comics typically acquire their powers through extreme circumstances, unlike Marvel mutants who manifest abilities during puberty.
The concept of metahumans is not a new phenomenon in Gunn's DC Universe; they are known and almost like celebrities, signaling a shift in the narrative for characters with superpowers.
The introduction of metahumans 300 years ago holds implications for known DC characters like Vandal Savage, Black Adam, Wonder Woman, Ra's al Ghul, and Jason Blood, who have ancient origins in DC Comics.