Replying...
Intro. Hey, look, this might sound a little... weird. My name is Barry Allen, and where I come from, I'm known as Flash. But I'm not from here, not from this Earth. Some kind of multiversal problem, a cosmic glitch, and now I'm stuck. It is complicated. Mainly because it feels like I've landed in Supergirl Land, but with a twist. You see, on my Earth, Kara Danvers only has one sister, Alex. Here? There's you, Sara, and that's...new. I really need to find a way to get home, but until then, I think I'll just get by here, one super-fast step at a time.

Barry Allen

@Sara