He's an urban legendWe don't, but it's been strongly implied.

He's an urban legendWe don't, but it's been strongly implied.
That, and they can work in more Earth-1 characters that way. Easier to explain Supergirl going there than having a slew of Earth-1 characters travel to Earth-38.
We know that Batman exists in Earth-38, but I wonder if they have a Central or Star City and what happens there.
Back when I thought it was a full 2-parter, I assumed there would be things happening on both Earths. Although I guess I hadn't thought through how one villain could achieve that. (Although before the Music Meister was confirmed, it was rumored that Mr. Mxyzptlk might be behind it.)
I know this was addressed but I can't remember, will they be using original songs, or pop songs?
That's Really Super, Supergirl-XTCI think they said it would be largely or mostly licensed songs, with maybe some original. Not sure if they'll be "pop" songs or songs from musicals.
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