CBSOf course, to Barry Allen, The Flash is a hero known the globe over. Similarly, to Kara Zor-El, Supergirl is a heroine known across the planet. So, it was great that the show dropped in a scene where neither of these heroes knew who the other one was. Obviously, The Flash has accidentally crash-landed in Karas world, so absolutely no one knows him here. But it was great, even if just for a few minutes, to see these larger-than-life well-known heroes humbled by the fact that neither had even the slightest of clues as to who the other was. And just for sh*ts and giggles, Barry even asked Kara if shed heard of Green Arrow, Black Canary, Firestorm, Atom, or Zoom. None of whom she had any idea of.