Zack Snyder Said Man of Steel's Open Pod Is "Something More"
Even without the prequel comic book, fans still speculated as to hints of Supergirl's existence in Man of Steel. Chief among these hints was an open pod in the background when Henry Cavill's Clark Kent first explored the Kryptonian scout ship that was buried in the Arctic ice shelf. Some thought this might be the mechanism through which Supergirl would be introduced later; the Supergirl of Superman: The Animated Series was revealed in a similar fashion, after Superman found a teenage girl named Kara in suspended animation among the ruins of Krypton's sister planet, Argo.
Snyder later shut down this line of speculation. In a conversation on Vero, a fan directly asked Snyder about the ending of the prequel comic and the open pod in Man of Steel being signs that Supergirl existed. While his response was largely glib and ignored the status of the pod, Snyder did point out that the fan was making a large assumption that it was Kara Zor-El, perhaps suggesting it wasn't her who left the Fortress of Solitude in the prequel comic.
Snyder was more specific in another chat on Vero, where he specifically said the open pod was not a sign of Supergirl. Describing the pod only as "something more", Snyder elaborated that it was a sign of "not Supergirl, but someone." This has prompted a whole new line of wild speculation, with everyone from Krypto the Super-Dog to Snyder's proposed "real Doomsday" being suggested as the mystery passenger.
There Is A Supergirl Clue In The DCEU... Somewhere
Despite pointing away from the pod and the prequel comic as signs of Kara Zor-El's presence on Earth, Snyder has confirmed that he had plans for opening a pathway to introduce Supergirl in later films. To the annoyance of fan theorists everywhere, however, Snyder has kept quiet as to the specifics of what those plans are. All Snyder has said is that "there's another way to get her that we put right in plain sight."
Was Kara present for the original battle with Steppenwolf thousands of years ago in Justice League? Did she become the mother of the Amazon race? Could the advanced, near-magical technology she had access to allow her to establish what would become the city of Atlantis before it sank? Considering the long span of history between when she crashed on Earth in the prequel comic and the start of Man of Steel (the film said it had been 20,000 years), there are many possibilities.
Ignoring the comic book, there are other ways that a Supergirl of sorts could be introduced into Snyder's reality. The most obvious means is the Kryptonian Growth Codex. Used properly, the Codex could create a true newborn Kryptonian - a spiritual cousin of sorts to Superman. Or perhaps a literal cousin if Clark were to use his own DNA as a template?
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