I'm delightfully surprised that they're finally going through with showing Superman on Supergirl, since I didn't think they would ever outright show him. I hope Lois isn't far behind
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Looking forward to seeing who they cast, how the show will characterize Clark, his interaction with Kara and her supporting cast (especially Cat and J'onn), if we'll see him in-suit, and what his role in the first two episodes will be.
I really hope we get to see Superman and Supergirl flying together
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I don't think they're going to do anything like de-power or kill him off via Death of Superman, since it's already established that he's given Kara a lot of freedom to be the sole hero National City and he's always busy with other disasters. I imagine this will just likely setup his visiting National City every now and then to check in on his cousin in person or the occasional Superman guest-appearance
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Though I wonder if this might end up tieing into a possible fusion of Supergirl's Earth with Arrowverse Earth-1?