Thread:Love Robin/@comment-26120048-20170218201404/@comment-366087-20170218214337

The decision was made on this wikia to keep Supergirl's show separate until such a time as they are crossing back and forth like walking through doors.

On this wikia Arrowverse locations are in the shared world with so far only Earth-2 included because the *STORIES* are intrinsic to the "Earth-1" characters and well-being.

The Alien Invasion crossover event *could* have been written WITHOUT Supergirl. In point of fact her episode had nothing to do with the invasion itself other than the last 2 minutes when Barry crosses over to ask for help.