Gunn himself hinted at this back in February 2023 by posting a tweet that shared art from the comics that have most influenced the burgeoning new DCU film slate, with a famous cover from All-Star Superman, alongside art from The Authority, Grant Morrison's run on Batman, and Alan Moore's Swamp Thing.

“It was just difficult to figure out where I was going to come from with Superman ,” Gunn said speaking to io9 in Los Angeles last week. “And I think that it really started with my dog in a lot of ways. The idea of putting in Krypto, I think, was the fun part for me, because that was something that we hadn’t really seen in a Superman movie.”