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The movie adapts Tom King and Bilquis Evely’s Supergirl: Woman of Tomorrow comic book run, in which Kara helps a girl named Ruthye Marye Knoll on her quest for revenge against the villainous Krem of the Yellow Hills. At the very outset of the story, as is made clear by the trailers, too, Supergirl is on a planet with a red sun, which allows her to get drunk. She’s at a low point, and as the comic unfolds, it becomes apparent why.
Supergirl Explains Why Kara Was Drunk In Superman

Although Supergirl‘s place in the DCU timeline is after Superman, this still gives us a definitive movie explanation for why she was drunk at the end of that movie. At this point, Kara is still struggling to deal with the grief of Krypton’s destruction and the loss of her family and so many others. Unlike her cousin, Kara wasn’t sent to Earth as a child, and thus bore witness to so much more of what happened to the planet, including the prolonged suffering of those on Argo City, something the trailer also references.
This new big-screen iteration of the Maid of Might uses alcohol as a coping mechanism for all that pain, which is where we found her in that Fortress of Solitude scene. That brash, messy version of the character is a reflection of everything she’s suffered and her attempts at dealing with it, and it adds much greater context to the cameo in Superman.








