The Flash, Season 6

[Flash sees Supergirl land on the ground after flying.]

Barry:
How did you do that?

Supergirl:
I'm Supergirl.

Barry:
You're who now?

Supergirl:
Sorry, I'm just a little ... disoriented from the scream. How did you save me?

Barry:
Well, I ... you fell out a window and I ... caught you and ran you all the way out here, which I did not mean to do, but I've been working on my speed, and ... guess I'm faster than I thought.

Supergirl:
Yes, but, I ... who are you?

Barry:
I'm the Flash.

Supergirl:
The who now?

Barry:
The Fl- wait, do you not know who I am?

Supergirl:
Should I?

Barry:
What about the Green Arrow? [Supergirl shrugs] Black Canary? [Supergirl shrugs again] Firestorm? Atom? Zoom?!

Supergirl:
Sorry...

Barry:
Oh boy. Not as sorry as I am. [takes off his mask] Hey. I'm Barry Allen, I'm the fastest man alive. I also think that I am on the wrong Earth ... I'm gonna need your help.